Add RHEL gating configuration

gating.yaml

@@ -0,0 +1,9 @@
+--- !Policy
+product_versions:
+  - rhel-9
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}
+  - !PassingTestCaseRule {test_case_name: baseos-ci.brew-build.tier1.functional}
+  - !PassingTestCaseRule {test_case_name: baseos-ci.brew-build.userspace-fips-mode.functional}
+  - !PassingTestCaseRule {test_case_name: baseos-ci.brew-build.tedude.validation}