--no-header flag implementation for generate systemd

Signed-off-by: Jakub Guzik <jakubmguzik@gmail.com>

pkg/api/server/register_generate.go

@@ -32,6 +32,11 @@ func (s *APIServer) registerGenerateHandlers(r *mux.Router) error {
 	//    default: false
 	//    description: Create a new container instead of starting an existing one.
 	//  - in: query
+	//    name: noHeader
+	//    type: boolean
+	//    default: false
+	//    description: Do not generate the header including the Podman version and the timestamp.
+	//  - in: query
 	//    name: time
 	//    type: integer
 	//    default: 10