Change test script to simulate failure (#6)

Author: DariuszPorowski

.github/workflows/merge-queue-demo.yaml

@@ -21,7 +21,7 @@ jobs:
     steps:
       - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
       - name: Run Expensive Test
-        run: ./scripts/test.sh sleep 5
+        run: ./scripts/test.sh fail
 
   # Scenario: Job that only runs on PRs (e.g., quick linting, or checks not needed for merge)
   pr-exclusive: