Distribute VS Code via a signed apt repository

[Tyriar]

This would make auto-updating possible on Debian-based OS's.

[Tyriar]

Unfortunately it doesn't look like the signing will be up in time for the release, pushing to April. /cc @joaomoreno

[joaomoreno]

Signatures are always a lengthy process...

It's enough if we get the debs and rpms out the door.

[typekpb]

does this one cover rpm repository as well, or should I create a new issue?