[runner] Back up and restore ~/.ssh files
#2261
Merged
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Preserve
~/.sshdirectory state, namelyenvironmentandauthorized_keysfiles, as follows:Before a job started:
<file>exists:<file>to<file>.dstack.bak<file><file>does not exist: remember thisAfter the job finished:
<file>existed: rename<file>.dstack.bakback to<file><file>did not exist: remove<file>Fixes: #2257