How to reload configuration after app.yml changes?

Sorry t revive this ancient topic, I just changed smtp auth parameters, I issue
/var/discourse # ./launcher restart app

  • /usr/bin/docker stop -t 10 app
    app

starting up existing container

  • /usr/bin/docker start app
    app

but it is still using old parameters, as changes was not taken
is there a cache? or something other I dunno…
thanks in advance for your help