git-export: relax git checking for special directory
This lift a constaint preventing us to push ther hg-git
repository on heptapod.
This instance will be upgraded to Heptapod 0.21.0rc2 on 2021-04-16 at 11:00 UTC+2 (a few minutes of down time)
This lift a constaint preventing us to push ther hg-git
repository on heptapod.