Add QA tooling

.github/workflows/lint.yml

@@ -0,0 +1,47 @@
+name: Lint
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  lint:
+    name: QA
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: ["8.2", "8.3"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: curl
+          coverage: none
+          tools: composer:v2, cs2pr
+
+      - name: Validate PHP syntax
+        run: find . -maxdepth 1 -name '*.php' -exec php --syntax-check {} +
+
+      - name: Validate composer.json
+        run: composer validate --no-check-publish
+
+      - run: composer install --no-progress --prefer-dist --optimize-autoloader --no-suggest
+
+      - run: vendor/bin/phpcs -q --report=checkstyle | cs2pr
+
+      - run: ./vendor/bin/phpstan analyse --error-format=checkstyle | cs2pr
+
+      - name: Run wp-plugin-check
+        uses: swissspidy/wp-plugin-check-action@v1
+        with:
+          exclude-checks: |
+            late_escaping
+            plugin_review_phpcs
+            file_type
+            plugin_readme
+

.gitignore

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+.DS_Store
+vendor