zmk-docker/.github/workflows/containers.yml

name: Containers

env:
  zephyr-version: 2.4.0
  zephyr-sdk-version: 0.11.4
  cache-repository-name: zmk-docker-cache

on:
  push:
  pull_request:
  workflow_dispatch:

jobs:
  docker:
    runs-on: ubuntu-latest
    strategy:
      max-parallel: 1 # takes advantage of caching between types
      matrix:
        architecture:
          - arm
        target: # ordered from biggest to smallest to take advantage of the registry cache
          - dev
          - build
    steps:
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ secrets.GHCR_USERNAME }}
          password: ${{ secrets.GHCR_TOKEN }}
      - name: Login to Docker Hub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_HUB_USERNAME }}
          password: ${{ secrets.DOCKER_HUB_TOKEN }}
      - name: Prepare variables
        id: vars
        env:
            DOCKER_HUB_NAMESPACE: ${{ secrets.DOCKER_HUB_NAMESPACE || github.repository_owner }}
        run: |
          echo ::set-output name=docker-hub-namespace::${DOCKER_HUB_NAMESPACE}

          NAME=zmk-${{ matrix.target }}-${{ matrix.architecture }}
          echo ::set-output name=name::${NAME}

          CANDIDATE_TAG=${NAME}:${{ github.sha }}
          echo ::set-output name=candidate-tag::${CANDIDATE_TAG}

          VERSIONS_TAG=${NAME}:${{ env.zephyr-version }}-${{ env.zephyr-sdk-version }}
          echo ::set-output name=versions-tag::${VERSIONS_TAG}

          MAJOR=$(echo ${{ env.zephyr-version }} | cut -d'.' -f 1)
          MINOR=$(echo ${{ env.zephyr-version }} | cut -d'.' -f 2)
          MAJOR_MINOR=${MAJOR}.${MINOR}
          echo ::set-output name=major-minor::${MAJOR_MINOR}

          LATEST_TAG=${NAME}:${MAJOR_MINOR}
          echo ::set-output name=latest-tag::${LATEST_TAG}

          TAG_TRIGGER_REF=refs/tags/${{ env.zephyr-version }}-${{ env.zephyr-sdk-version }}
          echo ::set-output name=tag-trigger-ref::${TAG_TRIGGER_REF}          
      - name: Set up QEMU
        if: ${{ !startsWith(github.ref, 'refs/tags') }}
        uses: docker/setup-qemu-action@v1
      - name: Set up Docker Buildx
        if: ${{ !startsWith(github.ref, 'refs/tags') }}
        uses: docker/setup-buildx-action@v1
      - name: Build and push (candidate)
        id: build-push
        if: ${{ !startsWith(github.ref, 'refs/tags') }}
        uses: docker/build-push-action@v2
        with:
          target: ${{ matrix.target }}
          build-args: |
            ZEPHYR_VERSION=${{ env.zephyr-version }}
            ARCHITECTURE=${{ matrix.architecture }}
            ZEPHYR_SDK_VERSION=${{ env.zephyr-sdk-version }}            
          labels: |
            org.opencontainers.image.source=${{ github.server_url }}/${{ github.repository }}            
          tags: |
            docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.candidate-tag }}            
          cache-from: type=registry,ref=docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ env.cache-repository-name }}:dev
          cache-to: type=registry,ref=docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ env.cache-repository-name }}:${{ matrix.target }},mode=max
          push: true
      - name: Image digest
        if: ${{ !startsWith(github.ref, 'refs/tags') }}
        run: echo ${{ steps.build-push.outputs.digest }}
      - name: Release (pull candidate, tag, push)
        if: ${{ github.ref == steps.vars.outputs.tag-trigger-ref }}
        run: |
          docker pull docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.candidate-tag }}
          docker tag docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.candidate-tag }} docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.versions-tag }}
          docker tag docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.candidate-tag }} docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.latest-tag }}
          docker tag docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.candidate-tag }} ghcr.io/${{ github.repository_owner }}/${{ steps.vars.outputs.candidate-tag }}
          docker tag docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.candidate-tag }} ghcr.io/${{ github.repository_owner }}/${{ steps.vars.outputs.versions-tag }}
          docker tag docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.candidate-tag }} ghcr.io/${{ github.repository_owner }}/${{ steps.vars.outputs.latest-tag }}
          docker push docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.candidate-tag }}
          docker push docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.versions-tag }}
          docker push docker.io/${{ steps.vars.outputs.docker-hub-namespace }}/${{ steps.vars.outputs.latest-tag }}
          docker push ghcr.io/${{ github.repository_owner }}/${{ steps.vars.outputs.candidate-tag }}
          docker push ghcr.io/${{ github.repository_owner }}/${{ steps.vars.outputs.versions-tag }}
          docker push ghcr.io/${{ github.repository_owner }}/${{ steps.vars.outputs.latest-tag }}          
  git:
    runs-on: ubuntu-latest
    needs: docker
    if: ${{ startsWith(github.ref, 'refs/tags') }}
    steps:
      - name: Prepare variables
        id: vars
        run: |
          MAJOR=$(echo ${{ env.zephyr-version }} | cut -d'.' -f 1)
          MINOR=$(echo ${{ env.zephyr-version }} | cut -d'.' -f 2)
          MAJOR_MINOR=${MAJOR}.${MINOR}
          echo ::set-output name=major-minor::${MAJOR_MINOR}

          TAG_TRIGGER_REF=refs/tags/${{ env.zephyr-version }}-${{ env.zephyr-sdk-version }}
          echo ::set-output name=tag-trigger-ref::${TAG_TRIGGER_REF}          
      - name: Checkout
        uses: actions/checkout@v2
        if: ${{ github.ref == steps.vars.outputs.tag-trigger-ref }}
      - name: Tag
        if: ${{ github.ref == steps.vars.outputs.tag-trigger-ref }}
        env:
          TAG: ${{ steps.vars.outputs.major-minor }}
        run: |
          git tag ${TAG}
          git push -f origin ${TAG}