add config file

DEBIAN/config

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -e
+
+. /usr/share/debconf/confmodule
+
+db_input high alice-auth/ldap-bind-password || true
+db_go
+
+exit 0

DEBIAN/postinst

@@ -8,4 +8,3 @@ db_get alice-auth/ldap-bind-password
 CONFIG=/etc/sssd/sssd.conf
 
 sed -i "s/ldap_default_authtok =.*/ldap_default_authtok = $RET/" $CONFIG
-db_go || true