name: docker-build

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

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Docker meta
        id: docker_meta
        uses: crazy-max/ghaction-docker-meta@v1
        with:
          images: ghcr.io/modrinth/knossos
      -
        name: Get branch name
        id: vars
        run: echo ::set-output name=short_ref::${GITHUB_REF#refs/*/}
      -
        name: Get short SHA
        id: slug
        run: echo "::set-output name=sha8::$(echo ${GITHUB_SHA} | cut -c1-8)"
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Login to GHCR
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      -
        name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          file: ./Dockerfile
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.docker_meta.outputs.tags }}
          labels: ${{ steps.docker_meta.outputs.labels }}
          build-args: |
            VERSION_ID=${{ steps.vars.outputs.short_ref }}-${{ steps.slug.outputs.sha8 }}