ci: Fix build and publish workflow (#49)

* feat: Provide linux/amd64 and linux/arm64 images
* fix: Fix (hopefull) lack of description under "About this versio"n on package version index

.github/workflows/docker-publish..yml

@@ -1,10 +1,5 @@
 name: Publish Docker Image to GHCR
 
-# This workflow uses actions that are not certified by GitHub.
-# They are provided by a third-party and are governed by
-# separate terms of service, privacy policy, and support
-# documentation.
-
 on:
   workflow_dispatch: 
   release:
@@ -28,69 +23,87 @@ jobs:
       # This is used to complete the identity challenge
       # with sigstore/fulcio when running outside of PRs.
       id-token: write
+    strategy:
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm64
 
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226
-
-      # Login against a Docker registry only when tag "vM.M.P"
-      # https://github.com/docker/login-action
-      - name: Login to image registry ${{ env.REGISTRY }}
-        if: startsWith(github.ref, 'refs/tags/v')
-        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Cat Dockerfile
+        run: cat Dockerfile
 
       # Extract metadata (tags, labels) for Docker
       # https://github.com/docker/metadata-action
       - name: Extract Docker metadata
         id: meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81
+        uses: docker/metadata-action@v4
         with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          flavor: |
-            latest=auto          
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}   
           tags: |
+            type=schedule
             type=ref,event=branch
             type=ref,event=pr
             type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}          
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+        env:
+          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index            
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Setup Docker buildx
+        uses: docker/setup-buildx-action@v3
+
+      # login to ghcr only when tagged with "v*"
+      - name: Login to image registry ${{ env.REGISTRY }}
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
       # 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@v5
         with:
           context: .
-          push: ${{ startsWith(github.ref, 'refs/tags/v') }}
+          platforms: ${{ matrix.platform }}
+          #push: ${{ startsWith(github.ref, 'refs/tags/v') }}
+          push: false
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+          annotations: ${{ steps.meta.outputs.annotations }}
+          provenance: mode=max
+          sbom: true
+          outputs: |
+            type=image,name=target,annotation-index.org.opencontainers.image.title=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.title'] }},annotation-index.org.opencontainers.image.description=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.description'] }},annotation-index.org.opencontainers.image.licenses=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.licenses'] }},annotation-index.org.opencontainers.image.documentation=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.documentation'] }},annotation-index.org.opencontainers.image.source=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.source'] }},annotation-index.org.opencontainers.image.url=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.url'] }}
+          # BuildKit doesn't preserve cache mounts in the GitHub Actions cache by default
+          # see: https://docs.docker.com/build/ci/github-actions/cache/#cache-mounts
+          # cache-from: type=gha
+          # cache-to: type=gha,mode=max
 
       # Install the cosign tool except on PR
       # https://github.com/sigstore/cosign-installer
       - name: Install cosign
         if: startsWith(github.ref, 'refs/tags/v')
-        uses: sigstore/cosign-installer@main
-        with:
-          cosign-release: 'v1.13.1'
+        uses: sigstore/cosign-installer@v3.4.0
 
-      # 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
+      - name: Sign the images with GitHub OIDC Token
         if: startsWith(github.ref, 'refs/tags/v')
         env:
-          COSIGN_EXPERIMENTAL: "true"
-        # This step uses the identity token to provision an ephemeral certificate
-        # against the sigstore community Fulcio instance.
-        run: echo "${{ steps.meta.outputs.tags }}" | xargs -I {} cosign sign {}@${{ steps.build-and-push.outputs.digest }}
+          DIGEST: ${{ steps.build-and-push.outputs.digest }}
+          TAGS: ${{ steps.meta.outputs.tags }}
+        run: |
+          images=""
+          for tag in ${TAGS}; do
+            images+="${tag}@${DIGEST} "
+          done
+          cosign sign --yes ${images}

Dockerfile

@@ -6,7 +6,7 @@ ARG GID=worker
 ARG VERSION_UNOSERVER=2.0.1
 
 LABEL org.opencontainers.image.title="unoserver-docker"
-LABEL org.opencontainers.image.description="Custom Docker Image that contains unoserver, LibreOffice and major set of fonts for file format conversions"
+LABEL org.opencontainers.image.description="Custom Container Image that contains unoserver, LibreOffice and major set of fonts for file format conversions"
 LABEL org.opencontainers.image.licenses="MIT"
 LABEL org.opencontainers.image.documentation="https://github.com/unoconv/unoserver-docker/blob/master/README.adoc"
 LABEL org.opencontainers.image.source="https://github.com/unoconv/unoserver-docker"

README.adoc

@@ -1,10 +1,10 @@
-= Unoserver Docker Image
+= Unoserver Container Image
 
-Docker image for unoserver
+Container image for unoserver
 
 == The environment
 
-This Docker image uses Alpine Linux as a base image and provides:
+This Container image uses Alpine Linux as a base image and provides:
 
 * link:https://www.libreoffice.org/[LibreOffice]
 * link:https://github.com/unoconv/unoserver[unoserver]
@@ -25,6 +25,8 @@ This Docker image uses Alpine Linux as a base image and provides:
 
 == How to use it
 
+NOTE: The `docker` can normally be replaced with `podman` as well.
+
 === In interactive mode
 
 Just run:
@@ -80,6 +82,7 @@ You need the following tools:
 
 === How to build
 
+[source,bash]
 ----
 docker build .
 ----