Set 'ASPNETCORE_ENVIRONMENT=Development' when running from visual studio

Jellyfin.Server/Properties/launchSettings.json

@@ -0,0 +1,10 @@
+{
+  "profiles": {
+    "Jellyfin.Server": {
+      "commandName": "Project",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}