Update tails-installer release process
In #8549 (closed) we discussed that updating tails-installer for every Tails
release might now not be necessary anymore. I think we still need to
update the RM release process and documentation with this new
Maybe we also need to define how it will happen instead?
Or do we simply maintain things as they are currently - that is now the RM can push to pkg-privacy? Should bertagaz also be added to pkg-privacy then?