What are the steps to reproduce your problem?

Installation Odoo via Doker

the database runs via a separate Odoo compose file

Environment variables are loaded in a file outside of the compose file

enriching the odoo.conf file with the abase connection information did not modify anything, other than hiding the other databases

the /mnt/extra-addons folder is mounted from the Odoo compose file 
CHOWN -R odoo:odoo, from a root prompt of the odoo container

the /etc/odoo folder is mounted from the Odoo compose file 
CHOWN -R odoo:odoo, from a root prompt of the odoo container

the var/lib/odoo folder is mounted from the Odoo compose file 
CHOWN -R odoo:odoo, from a root prompt of the odoo container 
loading applications in this directory

Modification de l'application Odoo en mode DEBUG=1 (developer mode)
via Settings 

relaunch of containers

app list update

What is the current behavior you observe?

the app does not load updates

What would be the expected behavior in this case?

the availability of newly loaded applications