build-docker-image.yml

name: Deploy Docker Image 🐳

on:
  # for each change in DESCRIPTION/Dockerfile (main branch) this job will be triggered
  push:
    branches:
      - main
    paths:
      - DESCRIPTION
      - Dockerfile
  # give possibility to run it manually
  workflow_dispatch:

permissions: write-all
env:
  REGISTRY: ghcr.io
  IMAGE_NAME: r-pkg-example
  R_VERSION: 4.3
  PLATFORMS: linux/amd64

concurrency:
  group: deploy-docker-image-${{ github.ref }} # manage concurrency (if there are two jobs deploy-docker-image on the same branch, one wwill be cancelled)
  cancel-in-progress: true

jobs:
  build-docker-image:
    runs-on: ubuntu-latest

    steps:

      - name: Checkout repo
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      # Install QEMU and buildx for multi platform images (see https://docs.docker.com/build/building/multi-platform/)
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      # Set up buildx
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
        id: buildx
        with:
          install: true

      # Set up cache (it will accelerate docker builds reusing the cache)
      - name: Cache Docker layers ♻️
        uses: actions/cache@v3
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ env.IMAGE_NAME }}
          restore-keys: |
            ${{ runner.os }}-buildx-${{ env.IMAGE_NAME }}

      - name: Log in to the Container registry 🗝
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push image 🏗
        uses: docker/build-push-action@v5
        with:
          context: ./
          file: ./Dockerfile
          push: true
          tags: "${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}:${{ env.R_VERSION }}"
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache-new
          platforms: ${{ env.PLATFORMS }}

      - name: Move cache ♻️
        run: |
          rm -rf /tmp/.buildx-cache
          if [ -f /tmp/.buildx-cache-new ]
          then {
            mv /tmp/.buildx-cache-new /tmp/.buildx-cache
          }
          fi
        shell: bash