New Swift Package Repository for Ubuntu/Debian Linux Distributions

[rlovelett (Ryan Lovelett)]

@gonsolo

Another long-term wish would be to build swift with the system clang (12 at the moment) and not include clang in swiftlang. But I guess this has to be sorted out at a higher level.

I agree. From my non-expert perspective that is a great way to increase adoption of Swift on Linux.