fix(tools/magrathea): pass through nix-build exit status r/5292

Something I missed last time reading through the process documentation
is that you can use a combination of `process` and `process-wait` to
determine the exit status of a child process *and* read from its
standard output. With `process*` we could even capture stderr, but we
probably want it mounted to the parent process' stderr anyways.

Change-Id: I9840f607df465caa80d28109e344e5fc1402949d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7259
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

0 files changed, 0 insertions, 0 deletions