ch-image: cached pull followed by non-cached pull breaks multiple sub-commands
Reproducer: ``` $ ch-image pull alpine:3.18 $ ch-image pull --no-cache alpine:3.18 $ ch-image delete alpine:3.18 fatal: not a git repository: '/var/tmp/reidpr.ch/img/alpine+3.18/ch/git' error: command failed with code 128: /usr/bin/git checkout 1eeb075b trace: charliecloud.py:588:cmd_base, charliecloud.py:624:cmd_stdout, build_cache.py:1012:git, build_cache.py:1243:unpack_delete, misc.py:65:delete, ch-image:361:main $ ch-image modify -i -- alpine:3.18 tmpimg copying image from cache ... fatal: not a git repository: '/var/tmp/reidpr.ch/img/alpine+3.18/ch/git' error: command failed with code 128: /usr/bin/git checkout --detach trace: charliecloud.py:588:cmd_base, charliecloud.py:624:cmd_stdout, build_cache.py:1012:git, build_cache.py:780:branch_nocheckout, modify.py:100:main, ch-image:361:main ``` To recover, manually delete the image: ``` $ rm -Rf $CH_IMAGE_STORAGE/img/alpine+3.18 ```
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