go-ethereum/.github/workflows/bnp.yml

name: CI:Build go-ethereum Image

on:
  pull_request:
    types:
      - closed
    branches:
      - main
  workflow_dispatch:

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Fetch PR number
        id: get-pr
        run: |
          PR_NUMBER=$(gh pr list --state merged --base main --search $(git rev-parse HEAD) --json number --jq '.[0].number' || echo "")
          echo "PR_NUMBER=${PR_NUMBER}" >> $GITHUB_ENV          
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Fail if no PR found
        if: env.PR_NUMBER == ''
        run: |
          echo "No merged PR found. Exiting."
          exit 1          

      - name: Fetch PR labels
        id: get-labels
        run: |
          LABELS=$(gh pr view $PR_NUMBER --json labels --jq '.labels[].name' || echo "")
          echo "PR_LABELS=${LABELS}" >> $GITHUB_ENV          
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Check if PR has CI:Build label
        if: contains(env.PR_LABELS, 'CI:Build')
        run: echo "CI:Build label found, proceeding with build."

      - name: Set up Docker Buildx
        if: contains(env.PR_LABELS, 'CI:Build')
        uses: docker/setup-buildx-action@v3

      - name: Log in to Docker Hub
        if: contains(env.PR_LABELS, 'CI:Build')
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Build and push Docker image
        if: contains(env.PR_LABELS, 'CI:Build')
        run: |
          docker build -t ${{ secrets.DOCKER_USERNAME }}/go-ethereum:latest .
          docker push ${{ secrets.DOCKER_USERNAME }}/go-ethereum:latest