Defines a private `in-staging.softwareheritage.org` dns subdomain.
in-staging as in a contraction of:
- in-house
- internal
- and synonym of "private" (in this context)
Feel free to provide a better/more suitable name, i'm bad at naming.
The public facing part (`staging.softwareheritage.org`) needs to be addressed outside of puppet within swh's gandhi account.
The ip range provided match what has already been done in tryouts.
That could possibly be changed as well.
Related T1876