flake: ImDisk on Windows CLI

```
   imdisk -a -s 4096M -m R: -p "/fs:ntfs /q /y"
  shell: C:\Windows\system32\cmd.EXE /D /E:ON /V:OFF /S /C "CALL "{0}""
'imdisk' is not recognized as an internal or external command,
operable program or batch file.
Error: Process completed with exit code 1.
```

seen here: https://github.com/coder/coder/actions/runs/15107647765/job/42459711693