Add {{.Temp}} variable to host templates

[jandubois]

Note

For discussion purposes; would need to apply changes to all templates if accepted.

See #2339 (comment) and #3316.

Allows writing the /tmp/lima mount as

mounts:
- location: "{{.Temp}}/lima"
  mountPoint: /tmp/lima

Note that on macOS this would use $TMPDIR and not /tmp, so would be a change in behaviour. It would not affect existing instances though.

[afbjorklund]

Do you need to model "the real" $TMPDIR, or should it be something like $LIMA_TEMP instead?

One concern was that there are many users sharing the /tmp/lima location, on a shared server.

[arixmkii]

This made default.yaml compatible with Windows. I managed to create and start VM w/o changes to template.

Output of the mount command:

C:\msys64\home\Arthu\gitrepos\lima\_output\bin>limactl shell default mount | find "sshfs"
time="2025-03-08T20:21:48+02:00" level=warning msg="treating lima version \"e0487475.m\" from \"C:\\\\Users\\\\Arthu\\\\.lima\\\\default\\\\lima-version\" as very latest release"
bash: line 1: cd: /mnt/c/msys64/home/Arthu/gitrepos/lima/_output/bin: No such file or directory
:/mnt/c/Users/Arthu on /mnt/c/Users/Arthu type fuse.sshfs (ro,nosuid,nodev,relatime,user_id=1000,group_id=1000,allow_other)
:/mnt/c/Users/Arthu/AppData/Local/Temp/lima on /tmp/lima type fuse.sshfs (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000,allow_other)

The /mnt/ prefixes come from WSL2 Alpine tools container (wslpath instead of cygpath), which I use for running QEMU. I'm yet to figure out required fixes to run it with Git bash msys2 stack (mux modes are not supported in msys2 OpenSSH).

[arixmkii]

9p mounts

C:\msys64\home\Arthu\gitrepos\lima\_output\bin>limactl shell default mount | find "9p"
time="2025-03-08T20:36:53+02:00" level=warning msg="treating lima version \"e0487475.m\" from \"C:\\\\Users\\\\Arthu\\\\.lima\\\\default\\\\lima-version\" as very latest release"
bash: line 1: cd: /mnt/c/msys64/home/Arthu/gitrepos/lima/_output/bin: No such file or directory
mount0 on /mnt/c/Users/Arthu type 9p (ro,relatime,cache=8f,access=client,msize=131072,trans=virtio)
mount1 on /tmp/lima type 9p (rw,relatime,cache=5,access=client,msize=131072,trans=virtio)