This commit fixes the issue that --extra-repo are not added
correctly to the repo registry when doing cross arch building.
The issue is that they get added early at the reporegistry
level and because we don't know yet what arch will be used
it was initially only added to the host arch. This was
fine before we supported cross-arch building.
But now that we do support cross-arch building this is
of course an issue and produces subtle bugs. This commit
is the "easy" fix, the extra repos are just added to for
all architectures. This may not be right but because they
are optional its the reponsibility of the user to provide
the right ones. Eventually we should probably be smarter
here and move extra repo support into manifestgen but
that requires changes in images and an images release so
this is good enough for now.
Thanks to Simon de Vlieger for reporting this.
75f24bbd2a