build-docker.yml

name: Build Docker

on:
  push:
    branches: [ master ]
    tags:
      - 'v*'

jobs:

  build:
    name: Build
    runs-on: ubuntu-latest
    strategy:
      matrix:
        platform: [linux/amd64, linux/386, linux/arm/v6, linux/arm/v7, linux/arm64]
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Set environment
        run: |
          export PLATFORM=${{ matrix.platform }}
          echo "::set-env name=PLATFORM_DASH::${PLATFORM////-}"
          echo "::set-env name=BUILD_FAIL::true"
        # ${foo////-} replaces slashes with dashes
        # foo='linux/arm/v7'
        # ${foo////-} -> linux-arm-v7

      - name: Set up Docker Buildx
        id: buildx
        uses: crazy-max/ghaction-docker-buildx@v1
        with:
          buildx-version: latest
          qemu-version: latest

      - name: Available platforms
        run: echo ${{ steps.buildx.outputs.platforms }}

      - name: Login to DockerHub Registry
        run: echo ${{ secrets.DOCKER_PASSWORD }} | docker login -u ${{ secrets.DOCKER_USERNAME }} --password-stdin

      - name: Run Buildx cache from registry
        continue-on-error: true
        run: |
          docker buildx build \
            --platform ${{ matrix.platform }} \
            --output "type=image,push=false" \
            --cache-from=type=registry,ref=${{ secrets.DOCKER_REPO }}:build-cache-$PLATFORM_DASH \
            . && echo "::set-env name=BUILD_FAIL::false"

      - name: Run Buildx local build cache
        if: env.BUILD_FAIL == 'true'
        continue-on-error: true
        run: |
          docker buildx build \
            --platform ${{ matrix.platform }} \
            --output "type=image,push=false" \
            . && echo "::set-env name=BUILD_FAIL::false"

      - name: Run Buildx no cache
        if: env.BUILD_FAIL == 'true'
        run: |
          docker buildx build \
            --platform ${{ matrix.platform }} \
            --output "type=image,push=false" \
            --no-cache .

      - name: Cache to registry
        continue-on-error: true
        run: |
          docker buildx build \
            --platform ${{ matrix.platform }} \
            --cache-from=type=registry,ref=${{ secrets.DOCKER_REPO }}:build-cache-$PLATFORM_DASH \
            --cache-to=type=registry,ref=${{ secrets.DOCKER_REPO }}:build-cache-$PLATFORM_DASH,mode=max .

      - name: Cache to local
        run: |
          docker buildx build \
            --platform ${{ matrix.platform }} \
            --cache-from=type=registry,ref=${{ secrets.DOCKER_REPO }}:build-cache-$PLATFORM_DASH \
            --cache-to=type=local,dest=docker-cache/${{ matrix.platform }},mode=max .

      - name: Upload local cache to artifact
        uses: actions/upload-artifact@v2
        with:
          name: docker-cache
          path: docker-cache


  deploy:
    name: Deploy Images
    needs: build
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Set environment
        run: |
          export TAG="${GITHUB_REF#'refs/tags/'}"
          echo "::set-env name=GH_TAG::$TAG"

      - name: Set up Docker Buildx
        id: buildx
        uses: crazy-max/ghaction-docker-buildx@v1
        with:
          buildx-version: latest
          qemu-version: latest

      - name: Login to DockerHub Registry
        run: echo ${{ secrets.DOCKER_PASSWORD }} | docker login -u ${{ secrets.DOCKER_USERNAME }} --password-stdin

      - name: Download local cache artifact
        uses: actions/download-artifact@v2
        with:
          name: docker-cache
          path: docker-cache

      - name: Run Buildx Dev
        if: startsWith(github.ref, 'refs/heads/') # Just the branches
        run: |
          docker buildx build \
            --platform linux/amd64,linux/386,linux/arm/v6,linux/arm/v7,linux/arm64 \
            --output "type=image,push=true" \
            --cache-from=type=local,src=docker-cache/linux/amd64 \
            --cache-from=type=local,src=docker-cache/linux/386 \
            --cache-from=type=local,src=docker-cache/linux/arm/v6 \
            --cache-from=type=local,src=docker-cache/linux/arm/v7 \
            --cache-from=type=local,src=docker-cache/linux/arm64 \
            -t ${{ secrets.DOCKER_REPO }}:dev .

      - name: Run Buildx Release
        if: startsWith(github.ref, 'refs/tags/') # Just the tags
        run: |
          docker buildx build \
            --platform linux/amd64,linux/386,linux/arm/v6,linux/arm/v7,linux/arm64 \
            --output "type=image,push=true" \
            --cache-from=type=local,src=docker-cache/linux/amd64 \
            --cache-from=type=local,src=docker-cache/linux/386 \
            --cache-from=type=local,src=docker-cache/linux/arm/v6 \
            --cache-from=type=local,src=docker-cache/linux/arm/v7 \
            --cache-from=type=local,src=docker-cache/linux/arm64 \
            -t ${{ secrets.DOCKER_REPO }}:release \
            -t ${{ secrets.DOCKER_REPO }}:$GH_TAG \
            -t ${{ secrets.DOCKER_REPO }}:stable \
            -t ${{ secrets.DOCKER_REPO }}:latest .