Add support for stylelint

ahoy.test.yml

@@ -74,3 +74,13 @@ commands:
       if [[ -f tests/junit/${module}.xml ]]; then JUNIT=--junit=tests/junit/${module}.xml; fi
       ahoy d4d exec vendor/bin/phpmetrics --report-html=tests/metrics/$module $JUNIT web/modules/contrib/$module $@
     usage: PHP Metrics by module
+  stylelintprepare:
+    cmd: |
+      /usr/local/bin/node_cmd yarn --cwd web/core add stylelint-junit-formatter
+    usage: Prepare environment for style linter
+  stylelintmodule:
+    cmd: |
+      module=$1
+      shift
+      /usr/local/bin/node_cmd yarn --silent --cwd web/core stylelint --formatter verbose --config ./.stylelintrc.json "../modules/contrib/${module}/**/*.css" --color
+    usage: Stylelint tests by module