docker.yml

name: Docker

on:
  # Automatically run after the Release workflow completes successfully.
  # (Events created by GITHUB_TOKEN don't trigger "release: published" in
  #  other workflows, so we use workflow_run instead.)
  workflow_run:
    workflows: ["Release"]
    types: [completed]
  # Manual trigger with an explicit tag.
  workflow_dispatch:
    inputs:
      tag:
        description: 'Tag to build (e.g., v1.0.0)'
        required: true
        type: string

permissions:
  contents: read
  packages: write

jobs:
  docker:
    name: Build and Push Docker Image
    runs-on: ubuntu-latest
    # Only run if the Release workflow succeeded (skip on failure/cancelled),
    # or if this was triggered manually.
    if: >-
      github.event_name == 'workflow_dispatch' ||
      github.event.workflow_run.conclusion == 'success'
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Determine tag
        id: get_tag
        run: |
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            TAG="${{ inputs.tag }}"
          else
            # workflow_run: find the latest semver tag pointing at HEAD
            TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "")
          fi

          if [ -z "$TAG" ]; then
            echo "::error::Could not determine release tag"
            exit 1
          fi

          echo "tag=$TAG" >> $GITHUB_OUTPUT
          echo "Using tag: $TAG"

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

      - name: Log in to GHCR
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ghcr.io/didstopia/githubby
          tags: |
            type=semver,pattern={{version}},value=${{ steps.get_tag.outputs.tag }}
            type=semver,pattern={{major}}.{{minor}},value=${{ steps.get_tag.outputs.tag }}
            type=semver,pattern={{major}},value=${{ steps.get_tag.outputs.tag }}
            type=raw,value=latest

      - name: Build and push
        uses: docker/build-push-action@v7
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: |
            VERSION=${{ steps.get_tag.outputs.tag }}
            COMMIT=${{ github.sha }}
            BUILD_DATE=${{ github.event.repository.updated_at }}
          cache-from: type=gha
          cache-to: type=gha,mode=max