PostgreSQL supports GSSAPI for authentication, communications encryption, or both.

GSSAPI support has to be enabled when PostgreSQL is built.

We should have a database option to enable/disable this setting.

The proposal could be:

$CFG->dboptions = [

    'dbpersist' => 0,

    'dbport' => 5432,

    'dbsocket' => '',

    'extrainfo' => [

        'gssencmode' => 'disable',

    ],

];