Allow passing options to `nix-build`

[ip1981]

It would be great if a way to pass options (like --keep-going) to nix-build existed: https://github.com/madjar/nox/blob/master/nox/review.py#L22

[madjar]

I was thinking the same thing earlier ! I'll do that.

[madjar]

Support for "--keep-going" has just been merged. Do you see any other useful options, or is keep-going enough ?

[ip1981]

I would prefer a general solution, like --nix-build-options=foo,bar like -Wl,<linker options> for GCC :-)

[DamienCassou]

--fallback is important for me today

[teh]

Just for reference: I recently found the undocumented env var _NIX_OPTIONS:

_NIX_OPTIONS="max-jobs=6" nox-review --keep-going pr 

which might be an OK replacement