build(./dev): export SCHEMA_MOD

SCHEMA_MOD is used at runtime in EMQX Erlang code
whenc loading configuration

dev

@@ -131,10 +131,10 @@ export PROFILE
 
 case "${PROFILE}" in
     emqx)
-        SCHEMA_MOD='emqx_conf_schema'
+        export SCHEMA_MOD='emqx_conf_schema'
         ;;
     emqx-enterprise)
-        SCHEMA_MOD='emqx_ee_conf_schema'
+        export SCHEMA_MOD='emqx_ee_conf_schema'
         ;;
 esac
 
@@ -329,11 +329,10 @@ boot() {
     copy_other_conf_files
     APPS="$(apps_to_load)"
 
-
     BOOT_SEQUENCE="
         Apps=[${APPS}],
         ok=lists:foreach(fun application:load/1, Apps),
-        io:format(user, \"~nLoaded ~p apps~n\", [length(Apps)]),
+        io:format(user, \"~nLoaded: ~p~n\", [Apps]),
         {ok, _} = application:ensure_all_started(emqx_machine).
     "