name: Push to Docker Hub

on:
  push:
    branches: [ main ]
    tags:
      - "*.*.*"
  pull_request:
    branches: [ main ]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Docker meta
        id: meta
        uses: crazy-max/ghaction-docker-meta@v2
        with:
          # list of Docker images to use as base name for tags
          images: |
            learningathome/petals
          # generate Docker tags based on the following events/attributes
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}

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

      - name: Login to Docker Hub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_HUB_USERNAME }}
          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}

      - name: Free disk space on Ubuntu runner
        uses: kfir4444/free-disk-space@main
        with:
          # found in: https://github.com/docker/build-push-action/issues/968
          tool-cache: false
          android: true
          dotnet: true
          haskell: true
          large-packages: true
          swap-storage: true

      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}

      - name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}