auto-build-on-base-image-change.yml

# FILE LOCATION IN REPOSITORY:
#
#   .github/workflows/auto-build-on-base-image-change.yml
#

name: Regular base image update check
on:
  schedule:
    - cron: "0 23 * * *"
  workflow_dispatch:
    inputs:
      force_build:
        description: 'Force docker image build.'
        default: false
        required: false
        type: boolean

jobs:
  build:
    runs-on: ubuntu-latest
    steps:

      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
      - uses: actions/checkout@v3

      - name: Docker Image Update Checker
        id: baseupdatecheck
        uses: lucacome/docker-image-update-checker@v1.2.1
        with:
          base-image: pihole/pihole:latest
          image: phynias/pihole-regex # update for your image

      # only execute subsequent steps if an update is actually NEEDED.
      # unfortunately we need to add an if-condition to all steps now
      # because a clean exit can't be triggered within a job it seems
      # (a cancellation is NOT the same and triggers a failure email)
      # see also https://github.com/actions/runner/issues/662
      - name: Login to DockerHub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
        if: ${{ steps.baseupdatecheck.outputs.needs-updating == 'true' || github.event.inputs.force_build == 'true' }}

      - name: Build and push Docker images
        uses: docker/build-push-action@v5
        with:
          context: "${{ github.workspace }}"
          push: true
          tags: phynias/pihole-regex:latest # update for your image
        if: ${{ steps.baseupdatecheck.outputs.needs-updating == 'true' || github.event.inputs.force_build == 'true' }}