Add HEAD to cors as well

Author: zendern

template/{% if has_backend %}backend{% endif %}/src/backend_api/app_def.py.jinja

@@ -96,7 +96,7 @@ try:
         CORSMiddleware,
         allow_origins=["*"],  # Super permissive CORS setting since this is for intranet
         allow_credentials=True,
-        allow_methods=["GET", "POST", "PUT", "DELETE", "OPTIONS"],
+        allow_methods=["GET", "POST", "PUT", "DELETE", "OPTIONS", "HEAD"],
         allow_headers=["*"],
     ){% endraw %}{% if backend_uses_graphql %}{% raw %}