pgadmin_ynh/conf/server.json

{
    "Servers": {
        "1": {
            "Name": "YunoHost Server",
            "Group": "Servers",
            "Host": "localhost",
            "Port": 5432,
            "MaintenanceDB": "postgres",
            "Username": "__DB_USER__",
            "Shared": false,
            "KerberosAuthentication": false,
            "ConnectionParameters": {
                "sslmode": "prefer",
                "connect_timeout": 10
            }
        }
    }
}