fix: [AH-413]: add file to FS (#2746)

* add header
* fix name
* add file to FS

registry/app/api/openapi/openapiutil.go

@@ -0,0 +1,20 @@
+//  Copyright 2023 Harness, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package openapi
+
+import "embed"
+
+//go:embed api.yaml
+var GitnessRegistryAPIYaml embed.FS