Resolves: #2096174 - RFE: add nginx:1.22 module stream

- fix modulemd v3 yaml file format
- add gating.yaml

gating.yaml

@@ -0,0 +1,10 @@
+--- !Policy
+product_versions:
+  - rhel-9
+decision_context: osci_compose_gate_modules
+subject_type: redhat-module
+rules:
+  - !PassingTestCaseRule {test_case_name: baseos-ci.redhat-module.tier1.functional}
+  - !PassingTestCaseRule {test_case_name: baseos-ci.redhat-module.tier2.functional}
+  - !PassingTestCaseRule {test_case_name: baseos-ci.redhat-module.tier3.functional}
+  - !PassingTestCaseRule {test_case_name: baseos-ci.redhat-module.acceptance-tier.functional}

nginx.yaml

@@ -8,11 +8,6 @@ data:
   description: >-
     nginx 1.22 webserver module
   license: [MIT]
-  dependencies:
-  - buildrequires:
-      platform: [el9]
-    requires:
-      platform: [el9]
   configurations:
   - context: '9'
     platform: el9
@@ -44,5 +39,5 @@ data:
     rpms:
       nginx:
         rationale: Module API.
-        ref: stream-1.22-rhel-9.2.0
+        ref: stream-nginx-1.22-rhel-9.2.0
 ...