Any plugins not merged in core can be disabled in the app.yml
If say for example you wanted to disable Chat in favour of a modified version. You would likely need to change it’s name and ensure maybe it uses it’s own install directory
I don’t recall a Discord plugin being in core.
That might be different as that is a login
Plugins or features merged with core. May need special handling to create a custom one to use instead.
Plugins merged in core are apart of the main program. I don’t believe Docker has any control over them
I tried to install chat after missing the update it was merged in core. This caused a rebuild fail.