chore: multi-arch support with buildx in all Dockerfiles

code-samples/community/serving/helloworld-clojure/README.md

@@ -109,11 +109,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-clojure .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-clojure
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-clojure" --push .
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-clojure/index.md

@@ -109,11 +109,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-clojure .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-clojure
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-clojure" --push .
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-dart/README.md

@@ -64,11 +64,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-dart .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-dart
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-dart" --push .
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-dart/index.md

@@ -8,7 +8,7 @@ that you can use for testing. It reads in the env variable `TARGET` and prints
 ## Prerequisites
 
 - A Kubernetes cluster with Knative installed and DNS configured. Follow the
-  [Knative installation instructions](https://knative.dev/docs/install/) if 
+  [Knative installation instructions](https://knative.dev/docs/install/) if
   you need to create one.
 - [Docker](https://www.docker.com) installed and running on your local machine,
   and a Docker Hub account configured (we'll use it for a container registry).
@@ -64,11 +64,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-dart .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-dart
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-dart" --push .
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-deno/README.md

@@ -83,11 +83,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-deno .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-deno
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-deno" --push .
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-deno/index.md

@@ -83,11 +83,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-deno .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-deno
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-deno" --push .
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-elixir/README.md

@@ -132,11 +132,8 @@ above.
     username:
 
     ```bash
-     # Build the container on your local machine
-     docker build -t {username}/helloworld-elixir .
-
-     # Push the container to docker registry
-     docker push {username}/helloworld-elixir
+    # Build and push the container on your local machine.
+    docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-elixir" --push .
     ```
 
 1.  After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-elixir/index.md

@@ -132,11 +132,8 @@ above.
     username:
 
     ```bash
-     # Build the container on your local machine
-     docker build -t {username}/helloworld-elixir .
-
-     # Push the container to docker registry
-     docker push {username}/helloworld-elixir
+    # Build and push the container on your local machine.
+    docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-elixir" --push .
     ```
 
 1.  After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-haskell/README.md

@@ -135,11 +135,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-haskell .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-haskell
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-haskell" --push .
    ```
 
 1. After the build has completed and the container is pushed to Docker Hub, you

code-samples/community/serving/helloworld-haskell/index.md

@@ -135,11 +135,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-haskell .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-haskell
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-haskell" --push .
    ```
 
 1. After the build has completed and the container is pushed to Docker Hub, you

code-samples/community/serving/helloworld-java-micronaut/README.md

@@ -215,11 +215,8 @@ your sample app to your cluster:
    following commands with your Docker Hub username.
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-java-micronaut .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-java-micronaut
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-java-micronaut" --push .
    ```
 
 1. Now that your container image is in the registry, you can deploy it to your

code-samples/community/serving/helloworld-java-micronaut/index.md

@@ -215,11 +215,8 @@ your sample app to your cluster:
    following commands with your Docker Hub username.
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-java-micronaut .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-java-micronaut
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-java-micronaut" --push .
    ```
 
 1. Now that your container image is in the registry, you can deploy it to your

code-samples/community/serving/helloworld-java-quarkus/README.md

@@ -218,15 +218,12 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-java-quarkus .
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-java-quarkus" --push .
 
    # (OR)
-   # Build the container on your local machine - Quarkus native mode
-   docker build -t {username}/helloworld-java-quarkus -f Dockerfile.native .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-java-quarkus
+   # Build and push the container on your local machine. - Quarkus native mode
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-java-quarkus" --push . -f Dockerfile.native
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-java-quarkus/index.md

@@ -217,15 +217,12 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-java-quarkus .
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-java-quarkus" --push .
 
    # (OR)
-   # Build the container on your local machine - Quarkus native mode
-   docker build -t {username}/helloworld-java-quarkus -f Dockerfile.native .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-java-quarkus
+   # Build and push the container on your local machine. - Quarkus native mode
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-java-quarkus" --push . -f Dockerfile.native
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-r/Dockerfile

@@ -3,14 +3,17 @@
 # https://hub.docker.com/_/golang
 FROM golang:1.12 as builder
 
+ARG TARGETOS
+ARG TARGETARCH
+
 # Copy local code to the container image.
 WORKDIR /go/src/github.com/knative/docs/helloworld-r
 COPY invoke.go .
 
 # Build the command inside the container.
 # (You may fetch or manage dependencies here,
 # either manually or with a tool like "godep".)
-RUN CGO_ENABLED=0 GOOS=linux go build -v -o invoke
+RUN CGO_ENABLED=0 GOOS=linux GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -v -o invoke
 
 # The official R base image
 # https://hub.docker.com/_/r-base

code-samples/community/serving/helloworld-r/README.md

@@ -77,14 +77,17 @@ cd knative-docs/code-samples/community/serving/hello-world/helloworld-r
   # https://hub.docker.com/_/golang
   FROM golang:1.12 as builder
 
+  ARG TARGETOS
+  ARG TARGETARCH
+
   # Copy local code to the container image.
   WORKDIR /go/src/github.com/knative/docs/helloworld-r
   COPY invoke.go .
 
   # Build the command inside the container.
   # (You may fetch or manage dependencies here,
   # either manually or with a tool like "godep".)
-  RUN CGO_ENABLED=0 GOOS=linux go build -v -o invoke
+  RUN CGO_ENABLED=0 GOOS=linux GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -v -o invoke
 
   # The official R base image
   # https://hub.docker.com/_/r-base
@@ -131,11 +134,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-r .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-r
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-r" --push .
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-r/index.md

@@ -77,14 +77,17 @@ cd knative-docs/code-samples/community/serving/hello-world/helloworld-r
   # https://hub.docker.com/_/golang
   FROM golang:1.12 as builder
 
+  ARG TARGETOS
+  ARG TARGETARCH
+
   # Copy local code to the container image.
   WORKDIR /go/src/github.com/knative/docs/helloworld-r
   COPY invoke.go .
 
   # Build the command inside the container.
   # (You may fetch or manage dependencies here,
   # either manually or with a tool like "godep".)
-  RUN CGO_ENABLED=0 GOOS=linux go build -v -o invoke
+  RUN CGO_ENABLED=0 GOOS=linux GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -v -o invoke
 
   # The official R base image
   # https://hub.docker.com/_/r-base
@@ -131,11 +134,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-r .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-r
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-r" --push .
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-rserver/README.md

@@ -102,11 +102,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-rserver .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-rserver
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-rserver" --push .
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-rserver/index.md

@@ -102,11 +102,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-rserver .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-rserver
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-rserver" --push .
    ```
 
 1. After the build has completed and the container is pushed to docker hub, you

code-samples/community/serving/helloworld-rust/README.md

@@ -136,11 +136,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-rust .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-rust
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-rust" --push .
    ```
 
 1. After the build has completed and the container is pushed to Docker Hub, you

code-samples/community/serving/helloworld-rust/index.md

@@ -136,11 +136,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-rust .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-rust
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-rust" --push .
    ```
 
 1. After the build has completed and the container is pushed to Docker Hub, you

code-samples/community/serving/helloworld-swift/README.md

@@ -116,11 +116,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-swift .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-swift
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-swift" --push .
    ```
 
 1. After the build has completed and the container is pushed to Docker Hub, you

code-samples/community/serving/helloworld-swift/index.md

@@ -116,11 +116,8 @@ folder) you're ready to build and deploy the sample app.
    username:
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-swift .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-swift
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-swift" --push .
    ```
 
 1. After the build has completed and the container is pushed to Docker Hub, you

code-samples/community/serving/helloworld-vertx/README.md

@@ -183,11 +183,8 @@ your sample app to your cluster:
    following commands with your Docker Hub username.
 
    ```bash
-   # Build the container on your local machine
-   docker build -t {username}/helloworld-vertx .
-
-   # Push the container to docker registry
-   docker push {username}/helloworld-vertx
+   # Build and push the container on your local machine.
+   docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/helloworld-vertx" --push .
    ```
 
 1. Now that your container image is in the registry, you can deploy it to your