Github Action that runs on Pull Request from a particular head branch, to a particular base branch

Question

I'd like a Github action to run on Pull Request to a specific base branch, but from another specific head branch.

name: Run production tests

on:  
  push:
  pull_request:
    branches:
      - main

jobs: ...

However, I specifically want something like this to run when a branch called develop is PR'd against main, not just every time something is PR'd to main.

Is such a workflow possible? I might be missing it, but I don't see a way to target head branches in the docs.

Answer 1

From the documentation, I could not find any filters for the head branch. But this is doable with if conditions for jobs. For example

name: Run production tests

on:  
  pull_request:
    branches:
      - main

jobs: 
  build:
    if: ${{ github.head_ref == 'develop'}}
    runs-on: ubuntu-latest

    steps:
      - name: Run a multi-line script
        run: |
          echo "Do something here"