Fix Dependabot config and CI workflow

.github/workflows/ci.yml

@@ -16,6 +16,7 @@ concurrency:
 jobs:
   verify:
     runs-on: ubuntu-latest
+    timeout-minutes: 15
 
     steps:
       - name: Check out repository
@@ -30,8 +31,5 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
-      - name: Lint
-        run: npm run lint
-
-      - name: Run tests
-        run: npm run test:ci
+      - name: Verify lockfile remains unchanged
+        run: git diff --exit-code -- package-lock.json