Add phpstan action

Signed-off-by: Erik Sommer <[email protected]>

.github/workflows/php-code-scanning.yml

@@ -0,0 +1,28 @@
+name: PHP Code Scanning
+
+on:
+  push:
+    branches:
+      - '*'  # Trigger on commits to any branch
+  pull_request:
+    branches:
+      - 'master'  # Trigger for PRs targeting the 'master' branch
+
+jobs:
+  phpstan:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '7.4'
+      - name: Install dependencies
+        run: |
+          composer install --no-interaction --prefer-dist
+      - name: Run PHPStan
+        run: |
+          vendor/bin/phpstan
+        continue-on-error: true