Gate rhel-9 on baseos-ci tests

Respective CI configuration already done, lets use what we have and move
to tmt later

gating.yaml

@@ -0,0 +1,6 @@
+--- !Policy
+product_versions:
+  - rhel-9
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: baseos-ci.brew-build.tier1.functional}