name: Trigger build for PR

on:
  pull_request_target:
    types: [labeled]

jobs:
  trigger-build:
    runs-on: ubuntu-latest
    if: contains(github.event.pull_request.labels.*.name, 'build-pr')

    steps:
    - name: Trigger PR build
      uses: peter-evans/repository-dispatch@v1
      with:
        token: ${{ secrets.GITHUB_TOKEN }}
        event-type: build-pr
        client-payload: '{"pr_number": ${{ github.event.pull_request.number }}}'