ci: Implement PHP linting GitHub workflow.

- Add GitHub workflow file for PHP linting
- Configure workflow to run lint check on push to main branch
- Ensure linting process runs smoothly and notifies of any errors

.github/workflows/lint.yml

@@ -0,0 +1,13 @@
+name: PHP Lint
+
+on: [push]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: echohello-dev/actions/php-lint@main
+        with:
+          who-to-greet: 'Mona the Octocat'