build.yml

on:
  push:
    branches:
      - main

jobs:
  build:
    name: Publish to GHCR
    env:
      IMAGE: ghcr.io/fogo-sh/grackdbot
    runs-on: ubuntu-latest
    permissions:
      packages: write
      contents: read
    steps:
      - name: Generate build ID
        id: prep
        run: |
          branch=${GITHUB_REF##*/}
          sha=${GITHUB_SHA::8}
          ts=$(date +%s)
          echo "::set-output name=BUILD_ID::${branch}-${sha}-${ts}"          

      - 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
        uses: docker/login-action@v1
        with:
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
          registry: ghcr.io

      - name: Build and publish container image with tag
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: |
            ${{ env.IMAGE }}:${{ steps.prep.outputs.BUILD_ID }}
            ${{ env.IMAGE }}:latest