pr.yml

name: "Validate pull request"

on:
  pull_request:
    branches:
      - main
    paths:
      - Makefile
      - Dockerfile
      - lib/**
      - scripts/**
      - .github/workflows/**

  workflow_dispatch:

env:
  TEST_TAG: grafana/${{ github.repository }}:test

jobs:
  validate:
    name: Validate pull request
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-tags: true

      - name: Unshallow
        run: git fetch --prune --tags --unshallow

      - name: Describe the current state
        run: git describe --tags --always

      - name: Docker meta
        id: docker_meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ghcr.io/${{ github.repository }}
          tags: |
            type=raw,value=sha-${{ github.sha }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Cache Docker layers
        uses: actions/cache@v3
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-

      - name: Login to GitHub Package Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - # This will only build the container image, not publish it
        name: Build container image and export to Docker
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ./Dockerfile
          push: false
          load: true
          tags: ${{ steps.docker_meta.outputs.tags }}
          labels: ${{ steps.docker_meta.outputs.labels }}
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max

      - name: Test container image
        run: |
          docker run --rm ghcr.io/${{ github.repository }}:sha-${{ github.sha }} image-test