ci: add workflow to run wp plugin checks

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

@@ -0,0 +1,21 @@
+name: Plugin check
+on:
+  push:
+    branches: [ stable', 'release/*' ]
+  pull_request:
+    branches: [ stable ]
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Package plugin
+        run: |
+          mkdir -p ./dist
+          rsync -rc --exclude-from=.distignore ./ ./dist/statify-blacklist --delete --delete-excluded
+      - name: Check WP plugin
+        uses: wordpress/plugin-check-action@v1
+        with:
+          build-dir: ./dist/statify-blacklist