ci: fail lint on warnings

We do not have any warnings right now. Let us keep it that way.

Signed-off-by: Max <[email protected]>

Author: max-nextcloud

.github/workflows/lint.yml

@@ -33,7 +33,7 @@ jobs:
     - name: npm install
       run: npm ci
     - name: eslint
-      run: npm run lint
+      run: npm run lint -- --max-warnings 0
     env:
       CI: true