Git branching strategy with GitHub Actions

I am trying to build the CI / CD for learning the Devops CI and CD flows with simple branching strategy.

Branch Strategy :

| branch name | environment |   
    main      --> prod 
    release/* --> uat 
    feature/* --> dev 

The scenario I am testing with the workflow below is as follows: whenever a developer pushes code to the feature/developer-1 branch, the build and deploy jobs should execute and deploy to the dev environment. After this, the developer will create a pull request to merge into the release/test-release branch, and the build and deploy jobs should run again. However, the workflow is skipping the jobs on the PR merge, and the jobs are incorrectly running in the feature branch instead of in the release/test-release branch after the merge.

Mock workflow :

name: mock CI/CD

on:
  push:
    branches:
      - 'feature/*'
  pull_request:
    branches:
      - 'release/*'

jobs:
  build:
    runs-on: ubuntu-latest
  if: |
    github.event_name == 'push' && startsWith(github.ref, 'refs/heads/feature/') || 
    (github.event_name == 'pull_request' && github.event.pull_request.merged == true && startsWith(github.event.pull_request.base.ref, 'release/'))
  steps:
    - name: Checkout code
      uses: actions/checkout@v3

    - name: Get commit message
      run: |
        echo "Commit message: $(git log -1 --pretty=%B)" > commit_message.txt

    - name: Display commit message
      run: cat commit_message.txt

    - name: Create build artifact
      run: |
        echo "Mock build complete."
        mv commit_message.txt file_build.txt

    - name: Upload build artifact
      uses: actions/upload-artifact@v3
      with:
        name: build
        path: file_build.txt

  deploy:
    runs-on: ubuntu-latest
    needs: build
    steps:
    - name: Checkout code
      uses: actions/checkout@v3

    - name: Download build artifact
      uses: actions/download-artifact@v3
      with:
        name: build
        path: .

    - name: Rename build artifact
      run: mv file_build.txt file_deploy.txt

    - name: Upload deploy artifact
      uses: actions/upload-artifact@v3
      with:
        name: deploy
        path: file_deploy.txt

here is my repo code - https://github.com/learndevops33/mock_ci_cd/tree/feature/developer-1

Ensure that your if condition correctly identifies when a PR is merged. For a PR merge, the github.event.action should be closed, and github.event.pull_request.merged should be true.

if: |
  github.event_name == 'push' && startsWith(github.ref, 'refs/heads/feature/') ||
  (github.event_name == 'pull_request' && github.event.action == 'closed' && github.event.pull_request.merged == true && startsWith(github.event.pull_request.base.ref, 'release/'))

EDIT:

I had it working using this syntax with specifying the closed condition in the event level.

  pull_request:
    branches:
      - 'release/*'
    types:
      - closed

Source documentation: Running your pull_request workflow when a pull request merges