build-and-push.yml

name: build-and-push

on:
  workflow_dispatch: {}
  schedule:
    - cron: "0 0 * * *"

jobs:
  check-version:
    runs-on: ubuntu-latest
    outputs:
      keel_tag: ${{ steps.keel_tag.outputs.value }}
      image_exists: ${{ steps.image_exists.outputs.value }}
    steps:
      - name: Get the latest release of keelhq/keel
        id: keel_tag
        run: |
          set -ex
          TAG="$(curl https://api.github.com/repos/keel-hq/keel/releases/latest -s | jq .name -r)"
          echo "value=${TAG}" >> $GITHUB_OUTPUT
      - name: Login to Docker Hub
        uses: docker/login-action@master
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Check if image exists
        id: image_exists
        run: |
          set -ex
          IMAGE="${{ secrets.DOCKERHUB_USERNAME }}/keel:${{ steps.keel_tag.outputs.value }}"
          if docker manifest inspect "$IMAGE" &> /dev/null; then
            echo "value=true" >> $GITHUB_OUTPUT
          else
            echo "value=false" >> $GITHUB_OUTPUT
          fi
  build-and-push:
    needs:
      - check-version
    if: needs.check-version.outputs.image_exists == 'false'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Keel
        uses: actions/checkout@main
        with:
          repository: keel-hq/keel
          ref: ${{ env.TAG }}
          path: keel
      - name: Set up QEMU
        uses: docker/setup-qemu-action@master
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@master
      - name: Login to Docker Hub
        uses: docker/login-action@master
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Build and push
        uses: docker/build-push-action@master
        with:
          context: keel
          # This is not ideal but the frequency of releases is low enough that it's not a big deal
          platforms: linux/amd64,linux/arm64
          push: true
          cache-from: type=gha
          cache-to: type=gha,mode=max
          tags: "${{ env.IMAGE }}:${{ env.TAG }},${{ env.IMAGE }}:latest"
    env:
      IMAGE: ${{ secrets.DOCKERHUB_USERNAME }}/keel
      TAG: ${{ needs.check-version.outputs.keel_tag }}