Set default value for PLATFORM_BASE_URL

autogpt_platform/backend/.env.example

@@ -39,7 +39,7 @@ SUPABASE_JWT_SECRET=your-super-secret-jwt-token-with-at-least-32-characters-long
 ## to use the platform's webhook-related functionality.
 ## If you are developing locally, you can use something like ngrok to get a publc URL
 ## and tunnel it to your locally running backend.
-PLATFORM_BASE_URL=https://your-public-url-here
+PLATFORM_BASE_URL=http://localhost:3000
 
 ## == INTEGRATION CREDENTIALS == ##
 # Each set of server side credentials is required for the corresponding 3rd party