PUBLIC_API_URL environment variable

The environment variable is not specified or set. It is required for frontend backend communication but currently not met. DataLens Platform requires setting PUBLIC_API_URL environment variable to the public backend API URL for frontend connectivity. Frontend requires backend API URL configured as PUBLIC_API_URL environment variable to connect to backend. DataLens Platform requires setting PUBLIC_API_URL environment variable to the public backend API URL for frontend connectivity. Frontend requires backend API URL configured as PUBLIC_API_URL environment variable to connect to backend.