Auto release on merge to main

.github/workflows/docker-publish.yml

@@ -0,0 +1,96 @@
+name: Docker
+
+on:
+  push:
+    branches: [ "main" ]
+    paths-ignore:
+      - README.md
+
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: gsa-tts/trestle
+
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      # This is used to complete the identity challenge
+      # with sigstore/fulcio when running outside of PRs.
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # Install the cosign tool except on PR
+      # https://github.com/sigstore/cosign-installer
+      - name: Install cosign
+        if: github.event_name != 'pull_request'
+        uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 #v3.5.0
+        with:
+          cosign-release: 'v2.2.4'
+
+      # Set up BuildKit Docker container builder to be able to build
+      # multi-platform images and export cache
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0
+
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@96383f45573cb7f253c731d3b3ab81c87ef81934 # v5.0.0
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          flavor: latest=true
+          tags: |
+            type=raw,value={{date 'YYYYMMDD'}},priority=850
+            type=ref,event=branch
+            type=sha
+
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          platforms: linux/arm64,linux/amd64
+
+      # Sign the resulting Docker image digest except on PRs.
+      # This will only write to the public Rekor transparency log when the Docker
+      # repository is public to avoid leaking data.  If you would like to publish
+      # transparency data even for private images, pass --force to cosign below.
+      # https://github.com/sigstore/cosign
+      - name: Sign the published Docker image
+        if: ${{ github.event_name != 'pull_request' }}
+        env:
+          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
+          TAGS: ${{ steps.meta.outputs.tags }}
+          DIGEST: ${{ steps.build-and-push.outputs.digest }}
+        # This step uses the identity token to provision an ephemeral certificate
+        # against the sigstore community Fulcio instance.
+        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}

Dockerfile

@@ -37,7 +37,7 @@ RUN adduser \
 # RUN --mount=type=cache,target=/root/.cache/pip \
 #     --mount=type=bind,source=requirements.txt,target=requirements.txt \
 #     python -m pip install -r requirements.txt
-ARG TRESTLE_VERSION=3.2.0
+ARG TRESTLE_VERSION=3.3.0
 RUN --mount=type=cache,target=/root/.cache/pip \
     python -m pip install "compliance-trestle==${TRESTLE_VERSION}"
 
@@ -46,7 +46,7 @@ USER appuser
 
 COPY --chown=appuser:appuser --chmod=744 entrypoint.sh /app/entrypoint.sh
 COPY --chown=appuser:appuser templates /app/templates/
-COPY OSCAL_REFERENCE.md /app/
+COPY *.md /app/
 COPY scripts /app/bin
 
 ENV PATH="/app/bin:${PATH}"

README.md

@@ -107,10 +107,12 @@ The `/app/docs` directory can be used as a scratch area for any temporary trestl
 ### Updating the Docker image:
 
 1. Make required changes to the Dockerfile
-1. Build the image: `docker build --platform linux/arm64,linux/amd64 -t ghcr.io/gsa-tts/trestle .`
+1. Push to GitHub and create a PR
+1. On merging to main, a new docker image will be built, tagged, and pushed to the github container registry.
 
-    > [!TIP]
-    > You may need to [enable containerd image store](https://docs.docker.com/desktop/containerd/#enable-the-containerd-image-store) to support mutli-platform builds.
+Each published image will be tagged with:
 
-1. Tag with a datestamp: `docker tag ghcr.io/gsa-tts/trestle ghcr.io/gsa-tts/trestle:YYYYMMDD`
-1. Push the new tag to Docker Hub: `docker push ghcr.io/gsa-tts/trestle:YYYYMMDD`
+1. `latest`
+1. The publication date: `YYYYMMDD`
+1. The branch it was created on: `main`
+1. The short git sha: `sha-c9f60e2`