switched to sed for php config

postfixadmin/postfixadmin-3.0/config.inc.php

 // pgsql = PostgreSQL
 // sqlite = SQLite 3
 $CONF['database_type'] = 'pgsql';
-$CONF['database_host'] = getenv('POSTGRES_HOST');
-$CONF['database_user'] = getenv('POSTGRES_USER');
-$CONF['database_password'] = getenv('POSTGRES_PASSWORD');
-$CONF['database_name'] = getenv('POSTGRES_DB');
+$CONF['database_host'] = 'POSTGRES_HOST';
+$CONF['database_user'] = 'POSTGRES_USER';
+$CONF['database_password'] = 'POSTGRES_PASSWORD';
+$CONF['database_name'] = 'POSTGRES_DB';
 // If you need to specify a different port for a MYSQL database connection, use e.g.
 //   $CONF['database_host'] = '172.30.33.66:3308';
 // If you need to specify a different port for POSTGRESQL database connection