WIP: fail CI forcefully to test the outcome job

Author: Kobzol

.github/workflows/ci.yml

@@ -172,6 +172,9 @@ jobs:
       - name: enable ipv6 on Docker
         run: src/ci/scripts/enable-docker-ipv6.sh
 
+      - name: fail
+        run: exit 1
+
       # Disable automatic line ending conversion (again). On Windows, when we're
       # installing dependencies, something switches the git configuration directory or
       # re-enables autocrlf. We've not tracked down the exact cause -- and there may