@Gliding9426 Yes, they should... when you install a plugin via NodeBB, the package.json file is updated, and the plugin is downloaded to the node_modules/ folder, along with its dependencies. Both of those are on-disk, which is ephemeral on a Docker instance.
If package.json is updated to include the plugin, then when ./nodebb upgrade -i (or npm i, etc.) is run, the plugin will be installed alongside, automatically.