I want the build slaves to be able to use 'cabal install' so that we don't have
to do any manual maintenance whenever a dependency changes.
One potential issue is that folks may object to having us install packages on
their behalf.
Isaac pointed out that you can point GHC to any package db you want, and I
noticed that cabal-install has a --package-db flag
Feel free to wont-fix this and say "well, we now require a buildbot user, so
problem solved"
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