Add custom files to deb packages

[lights0123]

Is your feature request related to a problem? Please describe.

I'd like to ship udev rules with my app. However, Tauri creates the .deb bundle before I can include them.

Describe the solution you'd like

An option to specify files that should be included in the final .deb bundle, similar to externalBin. However, they need to be able to be stored at any location. Also, there should be an option to include both architecture-specific and -generic files, as in my case, udev rules are the same on e.g. x86 and ARM.

Describe alternatives you've considered

Including as an externalBin, but that doesn't allow me to put files wherever I want on the filesystem.

Additional context

These files should probably not be included in the AppImage build.

[lucasfernog]

Let me know if I missed anything.