Debian pacakge has no ability to install arbitrary files into the system

[Jmennius]

• Electron-Builder Version: 26.0.0-alpha.7

• Node Version: 22.11.0

• Electron Version: ^33.2.0
• Electron Type (current, beta, nightly): current

• Target: x86_64, Debian package

It is quite common to have a package install various configuration files, plugins and so on under different directories under the filesystem root. It seems that there is no way to do this with electron-builder currently.
For example, I need to install a tmpfiles.d snippet or a systemd service (system or user) a configuration files under /etc or something else.

[mmaietta]

Would it be possible to add that file to extraFiles resources and then install it via a custom after-install.tpl?