How can I obtain the pathway that caused a pull request in GitHub Workflow?

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To obtain the pathway that caused a pull request in GitHub Workflow, you need to use the context of the pull request event. This context contains information about the pull request, including the branch that the pull request was made against.

Here is an example of how to obtain the branch name of the pull request in a GitHub Workflow:

name: My Workflow

on:
  pull_request:
    branches:
      - main

jobs:
  my-job:

    runs-on: ubuntu-latest

    steps:
    - name: Checkout code
      uses: actions/checkout@v2
      with:
        ref: ${{ github.event.pull_request.head.ref }}

    - name: Print branch name
      run: echo "Branch name is ${{ github.event.pull_request.head.ref }}"

In this example, the pull_request event is used as a trigger for the workflow. The ref parameter is used to checkout the branch of the pull request, and the github.event.pull_request.head.ref context variable is used to obtain the branch name. This branch name can then be used in subsequent steps of the workflow.