Add CORS header to well-known matrix endpoints.

docker/server/nginx.conf

@@ -37,6 +37,18 @@ http {
             add_header 'Content-Type' 'application/json';
             return 200 '{"status":"OK"}';
         }
+
+        location /.well-known/matrix/server {
+          default_type application/json;
+          add_header "Access-Control-Allow-Origin" *;
+          return 200 '{"m.server": "matrix.fizz.buzz:8448"}';
+        }
+
+        location /.well-known/matrix/client {
+          default_type application/json;
+          add_header "Access-Control-Allow-Origin" *;
+          return 200 '{"m.homeserver":{"base_url": "https://matrix.fizz.buzz"}}';
+        }
     }
 
 }