bug: Propagate errors from micromamba-shell #723

Job	Run time
bash (ubuntu-latest)	16s
bash (macos-latest)	26s
environment-file	16s
bash (windows-latest)	32s
micromamba-old-version-1	26s
micromamba-old-version-2	27s
micromamba-shell (ubuntu-latest)	15s
no-environment	4s
no-environment-file	15s
micromamba-shell (macos-latest)	17s
cmd	47s
conda-lock	10s
custom-condarc	19s
env-variable	16s
create-args-multiple-spaces-1	15s
multiple-shell-init	19s
powershell (ubuntu-latest)	17s
powershell (macos-latest)	22s
powershell (windows-latest)	49s
check-micromamba-on-path	20s
comment-in-environment-file	19s
correct-condarc	7s
create-args-multiple-spaces-2	21s
incorrect-condarc	4s
no-download-with-custom-path	19s
output-environment-path-custom-root-prefix	3s
output-environment-path-env-file	17s
output-environment-path-env-name-overwrite	20s
output-no-environment-path	7s
use-micromamba-from-path	20s
	9m 25s

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