dev-stack/default/pgadmin/servers.json

{
    "Servers": {
      "1": {
        "Name": "Dev Stack PostgresSQL",
        "Group": "Servers",
        "Port": 5432,
        "Username": "dev-stack-admin",
        "Host": "postgres",
        "SSLMode": "prefer",
        "MaintenanceDB": "main"
      }
    }
  }