ci: add workflow to run wp plugin checks

.gitattributes

@@ -1,6 +1,7 @@
 # Directories
 /.github export-ignore
 /.wordpress-org export-ignore
+/dist export-ignore
 /vendor export-ignore
 
 # Files

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

@@ -0,0 +1,22 @@
+name: Plugin check
+on:
+  push:
+    branches: [ 'master', 'release/*' ]
+  pull_request:
+    branches: [ 'master' ]
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Package plugin
+        run: |
+          mkdir -p dist/blacklist-updater
+          git archive HEAD | tar x --directory=dist/blacklist-updater
+
+      - name: Check WP plugin
+        uses: wordpress/plugin-check-action@v1
+        with:
+          build-dir: dist/blacklist-updater

.gitignore

@@ -1,2 +1,3 @@
 .idea/
+dist/
 vendor/