copy mamba.bat if it does not exist #737

Job	Run time
environment-file	17s
no-environment	3s
no-environment-file	18s
cmd	9s
env-variable	17s
bash (ubuntu-latest)	16s
bash (macos-latest)	24s
micromamba-old-version-1	26s
bash (windows-latest)	43s
micromamba-old-version-2	27s
micromamba-shell (ubuntu-latest)	16s
micromamba-shell (macos-latest)	35s
multiple-shell-init	21s
powershell (ubuntu-latest)	21s
powershell (macos-latest)	18s
comment-in-environment-file	20s
powershell (windows-latest)	44s
conda-lock	9s
create-args-multiple-spaces-1	20s
create-args-multiple-spaces-2	21s
custom-condarc	17s
output-environment-path-env-file	17s
check-micromamba-on-path	16s
correct-condarc	3s
incorrect-condarc	4s
no-download-with-custom-path	17s
output-environment-path-custom-root-prefix	5s
output-environment-path-env-name-overwrite	17s
output-no-environment-path	6s
use-micromamba-from-path	17s
	9m 4s

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