Add a point where we can add extra info for known repositories
Add a point where we can add extra info for known repositories

This will be useful for adding crypto credentials without people having
to update their config files.

Also useful point to add any other special casing for known repos.

lukexi/cabal,lukexi/cabal,kolmodin/cabal,ghc-android/cabal,gridaphobe/cabal,mightybyte/cabal,garetxe/cabal,ghc-android/cabal,bennofs/cabal,rimmington/cabal,thomie/cabal,gbaz/cabal,edsko/cabal,fugyk/cabal,beni55/cabal,sopvop/cabal,beni55/cabal,valderman/cabal,trskop/cabal,x-y-z/cabal,thoughtpolice/cabal,headprogrammingczar/cabal,mightybyte/cabal,martinvlk/cabal,randen/cabal,anton-dessiatov/cabal,Peaker/cabal,martinvlk/cabal,gbaz/cabal,themoritz/cabal,Heather/cabal,themoritz/cabal,enolan/cabal,Peaker/cabal,edsko/cabal,ian-ross/cabal,plow-technologies/cabal,headprogrammingczar/cabal,mmakowski/cabal,randen/cabal,gridaphobe/cabal,sopvop/cabal,ian-ross/cabal,fugyk/cabal,garetxe/cabal,Heather/cabal,mydaum/cabal,trskop/cabal,rimmington/cabal,mydaum/cabal,kolmodin/cabal,valderman/cabal,thoughtpolice/cabal,anton-dessiatov/cabal,mmakowski/cabal,thomie/cabal,themoritz/cabal,x-y-z/cabal,plow-technologies/cabal,sopvop/cabal,eric-stanley/cabal,enolan/cabal,bennofs/cabal,eric-stanley/cabal