Currently users rely on a complex workflow to distribute builds across runners: https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners
For example with build-push-action:
name: cion:
push:
env:
REGISTRY_IMAGE: user/appjobs:
build:
runs-on: ubuntu-lateststrategy:
fail-fast: falsematrix:
platform:
- linux/amd64
- linux/arm64steps:
- name: Preparerun: | platform=${{ matrix.platform }} echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV - name: Docker metaid: metauses: docker/metadata-action@v5with:
images: ${{ env.REGISTRY_IMAGE }}
- name: Login to Docker Hubuses: docker/login-action@v3with:
username: ${{ vars.DOCKERHUB_USERNAME }}password: ${{ secrets.DOCKERHUB_TOKEN }}
- name: Set up QEMUuses: docker/setup-qemu-action@v3
- name: Set up Docker Buildxuses: docker/setup-buildx-action@v3
- name: Build and push by digestid: builduses: docker/build-push-action@v6with:
platforms: ${{ matrix.platform }}labels: ${{ steps.meta.outputs.labels }}tags: ${{ env.REGISTRY_IMAGE }}outputs: type=image,push-by-digest=true,name-canonical=true,push=true
- name: Export digestrun: | mkdir -p ${{ runner.temp }}/digests digest="${{ steps.build.outputs.digest }}" touch "${{ runner.temp }}/digests/${digest#sha256:}" - name: Upload digestuses: actions/upload-artifact@v4with:
name: digests-${{ env.PLATFORM_PAIR }}path: ${{ runner.temp }}/digests/*if-no-files-found: errorretention-days: 1merge:
runs-on: ubuntu-latestneeds:
- buildsteps:
- name: Download digestsuses: actions/download-artifact@v4with:
path: ${{ runner.temp }}/digestspattern: digests-*merge-multiple: true
- name: Login to Docker Hubuses: docker/login-action@v3with:
username: ${{ vars.DOCKERHUB_USERNAME }}password: ${{ secrets.DOCKERHUB_TOKEN }}
- name: Set up Docker Buildxuses: docker/setup-buildx-action@v3
- name: Docker metaid: metauses: docker/metadata-action@v5with:
images: ${{ env.REGISTRY_IMAGE }}tags: | type=ref,event=branch type=ref,event=pr type=semver,pattern={{version}} type=semver,pattern={{major}}.{{minor}} - name: Create manifest list and pushworking-directory: ${{ runner.temp }}/digestsrun: | docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \ $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *) - name: Inspect imagerun: | docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}It often leads to confusion with already complex workflows which a reusable workflow could solve.
Currently users rely on a complex workflow to distribute builds across runners: https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners
For example with
build-push-action:It often leads to confusion with already complex workflows which a reusable workflow could solve.