build-and-publish.yaml

---
name: Build and Publish

on:
  push:
    branches:
      - redhat-** # IMPORTANT! this must match the jobs.build-and-publish.env.BRANCH_PREFIX (save the **).
  
  workflow_dispatch:
    # Allows you to run this workflow manually from the Actions tab
    inputs:
      tag:
        description: 'Tag to attach to image'     
        required: true

jobs:
  build-and-publish:
    name: Publish container image
    env:
      BRANCH_PREFIX: redhat- # IMPORTANT! this must match the .on.push.branches prefix!
      REGISTRY: quay.io/projectquay
      REPO_NAME: ${{ github.event.repository.name }}
      TAG_SUFFIX: -unstable
    runs-on: 'ubuntu-latest'
    steps:
      - name: Check out the repo
        uses: actions/checkout@v2

      - name: Set version from branch name
        id: version-from-branch
        if: startsWith('env.BRANCH_PREFIX', env.GITHUB_REF)
        run: |
          BRANCH_NAME=${GITHUB_REF#refs/heads/}
          echo "::set-output name=version::${BRANCH_NAME/${{ env.BRANCH_PREFIX }}/}"

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Login to Quay.io
        uses: docker/login-action@v1
        with:
          registry: quay.io
          username: ${{ secrets.QUAY_USER }}
          password: ${{ secrets.QUAY_TOKEN }}

      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        env:
          TAG: ${{ steps.version-from-branch.outputs.version }}${{ env.TAG_SUFFIX }}
        with:
          platforms: linux/amd64,linux/s390x,linux/ppc64le
          build-args: BUILDER_SRC=github.com/quay/quay-builder
          push: true
          file: Dockerfile
          tags: ${{ env.REGISTRY }}/${{ env.REPO_NAME }}:${{ github.event.inputs.tag || env.TAG }}