How to get latest commit from a PR merge? [Answer](https://github.community/t/how-to-get-latest-commit-from-a-pr-merge/121384/2)

action.yml

name: echo the latest commit on PR
on: pull_request
jobs:
  GetRecentCommit:
    name: Get Latest Commit
    if: ${{ github.event_name == 'pull_request' }}
    runs-on: ubuntu-latest
    steps:
      - name: List commits on the pull request
        run: |
          response=$(curl --request GET \
          --url 'https://api.github.com/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/commits' \
          --header 'Authorization: token ${{ secrets.GITHUB_TOKEN }}' \
          --header 'Accept: application/vnd.github.v3+json' \
          --header 'Content-Type: application/json')
          
          echo $response > response.json

      - name: Get latest commit
        run: |
          echo "Get length of the array:"
          length=$(jq 'length' response.json)

          echo "Get index of the latest commit:"
          index=$(($length - 1))

          echo "Get context of the latest commit:"
          latest_commit=$(jq --argjson index $index '.[$index]' response.json)

          echo "Get commit message of the latest commit:"
          latest_commit_message=$(echo "$latest_commit" | jq -r '.commit.message')
          echo "$latest_commit_message"