Use GitHub actions for CI.

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: [7.4, 8.1]
+    steps:
+    - uses: actions/checkout@v3
+    - name: Start MySQL
+      run: sudo /etc/init.d/mysql start
+    - name: Validate composer.json and composer.lock
+      run: composer validate --strict
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-scripts --no-suggest --no-interaction
+    - name: Ignore PHPCS warnings
+      run: ./vendor/bin/phpcs --config-set ignore_warnings_on_exit 1
+    - name: Install drupal
+      run: ./vendor/bin/drush site:install testing --root sut --db-url mysql://root:root@localhost/drupal --yes
+    - name: Run code sniffer
+      run: ./vendor/bin/phpcs --standard=PSR2 --ignore='sut,vendor' .
+    - name: Run unit tests
+      run: ./vendor/bin/phpunit