extend the schema validation to include repository-settings

For now the extra validation only includes the flags list.

Change-Id: Iceb905ed84fcb76dd33708a81dc63d8ebdd3c948
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

openstack_releases/schema.yaml

@@ -31,8 +31,14 @@ properties:
     type: "string"
     enum: ["tarball", "none"]
   repository-settings:
-    # TODO(dhellmann): Need to expand this to handle the flags.
     type: "object"
+    properties:
+      additionalProperties: False
+      flags:
+        type: "array"
+        items:
+          type: "string"
+          enum: [ "no-artifact-build-job", "retired" ]
   release-type:
     type: "string"
     enum: [ "python-service", "python-pypi", "xstatic", "fuel",