Replace `mv` with `sudo cp && rm` (or add `chown 0:0` after `mv`) elsewhere to ensure `root:root` ownership.

[peterschmidt85]

I think we should replace mv with sudo cp && rm (or add chown 0:0 after mv) elsewhere to ensure root:root ownership. For example, shim.env is owned by SSH user (as it uploaded via SFTP):

# ls -l /root/.dstack
total 33236
-rw-r--r--  1 root   root        278 Mar 26 14:24 host_info.json
drwxr-xr-x 11 root   root       4096 Mar 26 16:26 runners
-rw-rw-r--  1 debian debian      395 Mar 26 14:24 shim.env
-rw-r--r--  1 root   root   34015187 Mar 27 07:14 shim.log

Originally posted by @un-def in #3702 (comment)

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