dna-barcoding-analysis/.github/workflows/docker-build.yml at main · cosmelab/dna-barcoding-analysis · GitHub

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name: Build and Push Docker Image

# =============================================================================
# MANUAL TRIGGER ONLY (workflow_dispatch)
# =============================================================================
# This workflow builds and pushes the Docker container to GHCR and Docker Hub.
# It is ONLY triggered manually by the instructor to prevent students from
# seeing confusing "permission denied" errors when they push to their repos.
#
# HOW TO TRIGGER A NEW BUILD:
# 1. Go to GitHub repo → Actions tab
# 2. Click "Build and Push Docker Image" in the left sidebar
# 3. Click "Run workflow" button (top right)
# 4. Select 'main' branch → Click "Run workflow"
#
# The build takes ~2-3 minutes and pushes to:
# - ghcr.io/cosmelab/dna-barcoding-analysis:latest
# - docker.io/cosmelab/dna-barcoding-analysis:latest
# =============================================================================

on:
  workflow_dispatch:

permissions:
  contents: read
  packages: write

jobs:
  build:
    runs-on: ubuntu-latest
    if: github.repository == 'cosmelab/dna-barcoding-analysis'
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2
        with:
          platforms: linux/amd64,linux/arm64

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
        with:
          driver: docker-container
          buildkitd-flags: --debug

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

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ghcr.io/cosmelab/dna-barcoding-analysis
            docker.io/cosmelab/dna-barcoding-analysis
          tags: |
            type=raw,value=latest

      - name: Build and push
        uses: docker/build-push-action@v4
        with:
          context: .
          file: ./container/Dockerfile
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max