zabbix-docker/web-nginx-pgsql/alpine/conf/etc/zabbix/web/zabbix.conf.php

<?php
// Zabbix GUI configuration file.
global $DB, $HISTORY;

$DB['TYPE']     = 'POSTGRESQL';
$DB['SERVER']   = '{DB_SERVER_HOST}';
$DB['PORT']     = '{DB_SERVER_PORT}';
$DB['DATABASE'] = '{DB_SERVER_DBNAME}';
$DB['USER']     = '{DB_SERVER_USER}';
$DB['PASSWORD'] = '{DB_SERVER_PASS}';

// Schema name. Used for IBM DB2 and PostgreSQL.
$DB['SCHEMA'] = '{DB_SERVER_SCHEMA}';

$ZBX_SERVER      = '{ZBX_SERVER_HOST}';
$ZBX_SERVER_PORT = '{ZBX_SERVER_PORT}';
$ZBX_SERVER_NAME = '{ZBX_SERVER_NAME}';

$IMAGE_FORMAT_DEFAULT	= IMAGE_FORMAT_PNG;

// Elasticsearch url (can be string if same url is used for all types).
$HISTORY['url']   = '{ZBX_HISTORYSTORAGEURL}';
// Value types stored in Elasticsearch.
$HISTORY['types'] = {ZBX_HISTORYSTORAGETYPES};