name: Push to GHCR

on:
  push:
    tags:
      - '*'
  workflow_dispatch:
    inputs:
      tag:
        required: true
        description: "Build specific tag"

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Set tag name from manual dispatch
        if: ${{ github.event_name == "workflow_dispatch" }}
        run: |
          echo "tag_name=${{ github.event.inputs.tag }}" >> $GITHUB_ENV
      - name: Set tag name from Git
        if: ${{ github.event_name == "push" }}
        run: |
          echo "tag_name=${{ github.ref_name }}" >> $GITHUB_ENV
      - name: Checkout
        uses: actions/checkout@v2
        with:
          ref: ${{ env.tag_name }}
      - name: Set up Buildx
        uses: docker/setup-buildx-action@v1
      - name: Login to registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build & push
        uses: docker/build-push-action@v2
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: |
            ghcr.io/${{ github.repository }}:latest
            ghcr.io/${{ github.repository }}:${{ env.tag_name }}
          build-args: |
            gmnhg_version=${{ env.tag_name }}
          # TODO: set org.opencontainers.image.revision when this gets
          # fixed: https://github.com/actions/checkout/issues/209
          labels: |
            org.opencontainers.image.url="${{ github.server_url }}/${{ github.repository }}"
            org.opencontainers.image.source=${{ github.repositoryUrl }}
            org.opencontainers.image.version=${{ env.tag_name }}
            org.opencontainers.image.licenses=GPL-3.0
            org.opencontainers.image.title=gmnhg