env/.github/workflows/docker-publish.yml

name: publish docker images

on:
  push:
    branches:
    - main

env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ghcr.io
  # github.repository as <account>/<repo>
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    strategy:
      fail-fast: false
      matrix:
        tag:
        - alpine-desktopbase
        - alpine-slim
        - debian-node
        - fm
        - fedora
        - fedora-desktopbase
        - fedora-go
        - fedora-pwn
        - fedora-rust
        - ubuntu
        - ubuntu-desktopbase
    steps:
    - uses: actions/checkout@v2
    - name: log into registry ${{ env.REGISTRY }}
      if: github.event_name != 'pull_request'
      uses: docker/login-action@v1
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}
    - name: build and push Docker image
      uses: docker/build-push-action@v2
      with:
        file: .docker/${{ matrix.tag }}
        context: .
        push: ${{ github.event_name != 'pull_request' }}
        tags: ${{ env.REGISTRY }}/${{ github.repository }}:${{ matrix.tag }}
        labels: ${{ steps.meta.outputs.labels }}