Use check-mirrors repo from GitLab (tails#17728)
We're migrating check-mirrors.git to GitLab, and the repo in git.tails.boum.org will go away.
Manual steps done previous to this:
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Creation of user role-check-mirrors in GitLab.
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Configuration of the SSH key of tails_check_mirrors@misc.lizard in the role-check-mirrors user account in GitLab.
Ref: tails#17728 (closed)