General mechanism to supply "rich history" to git-ubuntu

[Dimitri John Ledkov]

My preference would be to open up some refs of git-ubuntu repositories to
uploaders to be read&write.

Such that one could created dgit like uploads and push the commit id, as a
ref, into the git-ubuntu repository directly. Aka
refs/heads/uploads/commit-hash as a branch.

Then upon import git-ubuntu could look up the Dgit header from the dsc, and
check if it knows about refs/heads/uploads/Dgit-header-from and reuse that
as part of the archive-matching set of branches.

Separately, I also want team uploads to be open to coredevs in the
git-ubuntu repositories, i.e. such that there is no need to create
~ubuntu-core-dev/ubuntu/+source/$package repositories and instead the main
git-ubuntu repository has refs/heads/teams/ubuntu-core-dev/* namespace
available for ubuntu-core-devs to push using per-ref ACLs in Launchpad.
This would finally enable to target merge proposals to git-ubuntu
repository, merge them, and for those commits to end up as part of the
git-ubuntu locked branches history via above /uploads/ namespace.

I do not want to maintain additional repositories, neither short or long
term, outside of the git-ubuntu ones. And keep a 1-to-1 mapping with them.

The goal is to allow merging merge proposals into the git-ubuntu repository
namespaced refs. And for them to end up in the git-ubuntu managed refs, if
and when, the matching upload of those changes is accepted in the archive.
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