mixin: commit the rendered rules and alerts

The rule files rendered from the default configuration are committed next
to the sources so they can be used without Jsonnet. mise run check-rules
regenerates them and fails on a difference; CI and mise run test run it,
like the dashboard drift check.

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

.github/workflows/mixin.yml

@@ -64,6 +64,9 @@ jobs:
       - name: Build dashboard and check generated changes
         run: mise run check-dashboards
 
+      - name: Generate rules and check generated changes
+        run: mise run check-rules
+
       - name: Lint dashboard and test rules
         run: mise run test