How to add a package to official raspbian repositories ?
Debian has a very extensive guide into the matter : https://www.debian.org/doc/manuals/distribute-deb/distribute-deb.html#adding-packages-to-debian
But what about raspbian ?
Will it "automagically" mirror every package present in debian repos ?
It depends.
If the program has no dependencies on Pi specific libraries then getting it into Debian is the way to go. It should then be pulled in from there and built by our autobuilders.
If it does depend on Pi specific libraries then you will need to prepare suitable packages and file a bug report with us and I will try to take a look. If adding pi-specific functionality to an existing program then it must be done as an additional package with new source/binary names, NOT a replacement for a package imported from Debian.
