use Mix.Config config :chess, ChessWeb.Endpoint, http: [port: {:system, "PORT"}], url: [host: "localhost", port: {:system, "PORT"}], cache_static_manifest: "priv/static/cache_manifest.json", server: true, root: "./assets", version: Application.spec(:myapp, :vsn), secret_key_base: "${SECRET_KEY_BASE}" config :chess, Chess.Repo, adapter: Ecto.Adapters.Postgres, url: "${DATABASE_URL}", database: "", ssl: true, pool_size: 1