Introducing deb and rpm auto-updates (help wanted)

[mmaietta]

Hey folks!

One of the maintainers for electron-builder here. Looking for feedback on my Draft PR for deb and rpm auto-updates.

I've gotten it to work with various VMs on my local machine, but I don't know enough about the Linux ecosystem to verify I've covered enough use cases/flows (GUI sudo + package manager options). Also, need to determine if we can read a file from the linux package when instantiating autoUpdater (manually written to resources package-type that contains rpm or deb as text to self-identify the app's installation method). Alternative approaches/suggestions are welcome.

Please take a look when you have a chance and leave comments https://github.com/electron-userland/electron-builder/pull/7060

Thank you!