name: "[PR] Publish Docker preview image"

on:
  pull_request:
    types: [opened, synchronize, reopened, ready_for_review]
    branches:
      - dev
  workflow_dispatch:
    inputs:
      pr-number:
        description: "PR number (uses head ref of that PR)"
        required: true
        type: number
      ref:
        description: "Git ref to build (branch, tag, or SHA)"
        required: false
        type: string
        default: ""

permissions:
  contents: read
  packages: write

env:
  SKIP_ENV_VALIDATION: true
  REGISTRY: ghcr.io
  GHCR_REPO: ghcr.io/homarr-labs/homarr-test
  TURBO_TELEMETRY_DISABLED: 1

concurrency:
  group: pr-docker-${{ github.event.inputs.pr-number || github.event.number }}
  cancel-in-progress: true

jobs:
  build-and-push:
    name: Build and push PR preview image
    runs-on: ubuntu-latest
    timeout-minutes: 25
    if: |
      github.event_name == 'workflow_dispatch' ||
      (
        github.event_name == 'pull_request' &&
        github.event.pull_request.draft == false &&
        github.event.pull_request.head.repo.full_name == github.repository
      )
    steps:
      - uses: actions/checkout@v6
        with:
          persist-credentials: false
          ref: ${{ github.event.inputs.ref || '' }}

      - name: Determine tag
        id: tag
        run: |
          PR_NUMBER="${{ github.event.inputs.pr-number || github.event.number }}"
          echo "tag=pr-${PR_NUMBER}" >> "$GITHUB_OUTPUT"
          echo "pr-number=${PR_NUMBER}" >> "$GITHUB_OUTPUT"

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: "${{ env.GHCR_REPO }}"
          tags: |
            type=raw,value=${{ steps.tag.outputs.tag }}

      - name: Log in to the Container registry
        uses: docker/login-action@v4
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4

      - name: Build and push
        uses: docker/build-push-action@v7
        with:
          context: .
          network: host
          platforms: linux/amd64
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          push: true
          cache-from: type=gha
          cache-to: type=gha,mode=max
        env:
          SKIP_ENV_VALIDATION: true