Hello @Tomas_Da_Mota ,
Thanks for sharing your issue with us here in the community.
I check your description and when you say you build and run you mean you are recreating your docker container, correct? I see some discussion on the past around it in How to add custom nodes on Docker Configuration - #4 by tight-crow-1218
Other discussion also in here Install n8n-nodes-module in custom n8n image - #8 by Dtneo
Let us know if the discussions added any insight you may have missed.
Cheers, Flavio