Add raspbian (armhf/arm64) packages

We do not provide a raspbian package anymore due to complications with cross-building our Qt package (libqt-jami), now used for building both the client library (lrc) and the Qt client (jami-qt). Since lrc is also built using libqt-jami, we cannot continue providing a jami-gnome raspbian package either.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information