restic/.github/workflows/docker.yml

name: Create and publish a Docker image

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

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    if: github.repository == 'restic/restic'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Log in to the Container registry
        uses: docker/login-action@0d4c9c5ea7693da7b068278f7b52bda2a190a446
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}            

      - name: Set up QEMU
        uses: docker/setup-qemu-action@68827325e0b33c7199eb31dd4e31fbe9023e06e3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@2b51285047da1547ffb1b2203d8be4c0af6b1f20

      - name: Ensure consistent binaries
        run: |
          echo "removing git directory for consistency with release binaries"
          rm -rf .git          
        # remove VCS information from release builds, keep VCS for nightly builds on master
        if: github.ref != 'refs/heads/master'

      - name: Build and push Docker image
        uses: docker/build-push-action@15560696de535e4014efeff63c48f16952e52dd1
        with:
          push: true
          context: .
          file: docker/Dockerfile.release
          platforms: linux/386,linux/amd64,linux/arm,linux/arm64
          pull: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}