[TASK] Lint Frontend sources in CGL workflow

Author: eliashaeussler

.github/workflows/cgl.yaml

@@ -48,3 +48,13 @@ jobs:
       # SCA
       - name: SCA PHP
         run: composer sca:php -- --error-format github
+
+      # Install Frontend dependencies
+      - name: Install Frontend dependencies
+        run: yarn --cwd Resources/Private/Frontend --frozen-lockfile
+
+      # Frontend linting
+      - name: Lint SCSS
+        run: yarn --cwd Resources/Private/Frontend lint:scss
+      - name: Lint TypeScript
+        run: yarn --cwd Resources/Private/Frontend lint:ts