test: add the wordpress plugin check action

.github/workflows/wordpress-plugin-check.yml

@@ -0,0 +1,27 @@
+name: 'WordPress Plugin Check'
+on:
+  pull_request
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Setup PHP
+      uses: "shivammathur/setup-php@v2"
+      with:
+        php-version: 'latest'
+        ini-values: memory_limit=1G'
+        coverage: none
+        tools: cs2pr
+
+    - name: Install Composer dependencies
+      uses: "ramsey/composer-install@v2"
+      with:
+        # Bust the cache at least once a month - output format: YYYY-MM.
+        custom-cache-suffix: $(date -u "+%Y-%m")
+
+    - name: Run plugin check
+      uses: wordpress/plugin-check-action@v1