Merge pull request #3 from schklom/patch-1

Build for multiple CPU architectures

.github/workflows/docker-publish.yml

@@ -45,6 +45,10 @@ jobs:
         with:
           cosign-release: 'v1.9.0'
 
+      # Setup QEMU
+      # https://github.com/marketplace/actions/docker-setup-buildx#with-qemu
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v2.0.0
       
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
@@ -78,6 +82,9 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          # https://github.com/docker/setup-qemu-action#about
+          # platforms: linux/amd64,linux/arm64,linux/riscv64,linux/ppc64le,linux/s390x,linux/386,linux/mips64le,linux/mips64,linux/arm/v7,linux/arm/v6
+          platforms: linux/amd64,linux/arm64,linux/arm/v6,linux/arm/v7
 
       # Sign the resulting Docker image digest except on PRs.
       # This will only write to the public Rekor transparency log when the Docker