ci: Upload static build artifacts

Make a static build and upload as artifact.
This makes it possible to download the binary produced for each PR.
In a follow up PR we could also automate binary upload upon release
as well as enabling different arch or OS.

Note that we use musl-gcc as it allows to statically link a libc
implementation while CGO_ENABLED=0 only was leading to the error below:
```
ethermint@v0.22.0-sdk50-1/app/ante/eip712.go:293:36: undefined: secp256k1.RecoverPubkey
ethermint@v0.22.0-sdk50-1/app/ante/eip712.go:319:17: undefined: secp256k1.VerifySignature
```

.github/workflows/build.yml

@@ -7,6 +7,8 @@ on:
       - main
       - release/**
       - upgrade/**
+      # TODO: debugging
+      - feature/upload_build_artifact
 permissions:
   contents: read
 
@@ -20,9 +22,10 @@ jobs:
     strategy:
       matrix:
         go-arch: ["amd64"]
+        go-os: ["linux"]
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-go@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
         with:
           go-version: "^1.21"
       - uses: technote-space/get-diff-action@v6.1.2
@@ -36,6 +39,33 @@ jobs:
             **/go.sum
             **/Makefile
             Makefile
-      - name: Build
-        if: env.GIT_DIFF
-        run: GOARCH=${{ matrix.go-arch }} LEDGER_ENABLED=false make build
+      # TODO: reenable once everything is working
+      # Non-static build with Go
+      # - name: Non-static Build with Go
+      #   run: |
+      #     GOARCH=${{ matrix.go-arch }} GOOS=${{ matrix.go-os }} LEDGER_ENABLED=false make build
+      #     mv ./build/cantod ./build/cantod-nonstatic-${{ matrix.go-os }}-${{ matrix.go-arch }}
+      - name: Install musl-tools
+        run: sudo apt-get update && sudo apt-get install -y musl-tools
+      - name: Static Build
+        env:
+          CC: musl-gcc
+          CGO_ENABLED: 1
+          GOARCH: ${{ matrix.go-arch }}
+          GOOS: ${{ matrix.go-os }}
+          LEDGER_ENABLED: false
+          LDFLAGS: "-extldflags -static"
+        run: |
+          # TODO: move to env or line break
+          # CC=musl-gcc CGO_ENABLED=1 GOARCH=${{ matrix.go-arch }} GOOS=${{ matrix.go-os }} LEDGER_ENABLED=false make build LDFLAGS="-extldflags \"-static\""
+          make build
+          # TODO debugging
+          ls -lh build/cantod
+          file build/cantod
+          build/cantod
+          mv build/cantod ./build/cantod-${{ matrix.go-os }}-${{ matrix.go-arch }}
+      - name: Upload cantod Binary (Static)
+        uses: actions/upload-artifact@v4
+        with:
+          name: cantod-${{ matrix.go-os }}-${{ matrix.go-arch }}
+          path: ./build/cantod-${{ matrix.go-os }}-${{ matrix.go-arch }}

Dockerfile

@@ -1,23 +1,25 @@
-FROM golang:stretch AS build-env
+# TODO: debugging
+FROM golang:1.21 AS build-env
 
 WORKDIR /go/src/github.com/canto/canto
 
 RUN apt-get update -y
 RUN apt-get install git -y
+RUN curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun
 
 COPY . .
 
 RUN make build
 
-FROM golang:stretch
-
-RUN apt-get update -y
-RUN apt-get install ca-certificates jq -y
-
-WORKDIR /root
-
-COPY --from=build-env /go/src/github.com/canto/canto/build/cantod /usr/bin/cantod
-
-EXPOSE 26656 26657 1317 9090
-
-CMD ["cantod"]
+# FROM golang:stretch
+# 
+# RUN apt-get update -y
+# RUN apt-get install ca-certificates jq -y
+# 
+# WORKDIR /root
+# 
+# COPY --from=build-env /go/src/github.com/canto/canto/build/cantod /usr/bin/cantod
+# 
+# EXPOSE 26656 26657 1317 9090
+# 
+# CMD ["cantod"]