Luke Granger-Brown 2194711ae0 nixos/virtualbox-image: cast baseImageFreeSpace into str
This fixes an evaluation error that's blocking the nixos-unstable
channel (#132328).

(cherry picked from commit b5fab53628e8f080bae24ea1396f72d9d21e1f9b)
2021-08-03 02:47:14 +02:00
..
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