add option to run (prepare/start)

helpful for containers

system/sbin/kazoo-kamailio

@@ -238,6 +238,17 @@ check_config ()
 }
 
 case "$1" in
+    runuser)
+        shift
+        prepare
+        USER="$(whoami)" 
+        start $@
+        ;;
+    run)
+        shift
+        prepare
+        start $@
+        ;;
     prepare)
         prepare
         ;;