publish.yml

name: Publish Docker Image

on:
  release:
    types: [published]

jobs:
  publish:
    runs-on: ubuntu-latest

    steps:
      - name: Get image tag
        id: image_tag
        run: echo ::set-output name=tag::${GITHUB_REF:10}

      - name: Checkout
        uses: actions/checkout@v2

      - name: Create Docker context
        run: docker context create mycontext

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1
        with:
          endpoint: mycontext

      - name: Cache Docker layers
        uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-

      - name: Login to GHCR
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Get repo in lowercase
        id: repo_name
        run: echo ::set-output name=repo::$(echo ${{ github.repository }} | tr '[:upper:]' '[:lower:]')

      - name: Build & push image
        uses: docker/build-push-action@v2
        with:
          context: .
          builder: ${{ steps.buildx.outputs.name }}
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ghcr.io/${{ steps.repo_name.outputs.repo }}:${{ steps.image_tag.outputs.tag }},ghcr.io/${{ steps.repo_name.outputs.repo }}:latest
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max

        # Temp fix
        # https://github.com/docker/build-push-action/issues/252
        # https://github.com/moby/buildkit/issues/1896
      - name: Move cache
        run: |
          rm -rf /tmp/.buildx-cache
          mv /tmp/.buildx-cache-new /tmp/.buildx-cache