Ecto connection error with gcloud postgres instance

Questions & Help Questions
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1

I am trying to connect to a gcloud postgres instance from my application
this the config

config :hello, Hello.Repo,
  username: System.get_env("POSTGRES_USER", "postgres"),
  password: System.get_env("POSTGRES_PASSWORD", "postgres"),
  database: "hello_dev",
  hostname: "/cloudsql/<project_name>:<region>:<instance_name>,
  pool_size: 10

but getting error non-existing domain
I tried to use socket in place of hostname but it’s not working

Thanks for the help.