`nerdctl.lima` should recognize `$LIMA_INSTANCE`

[AkihiroSuda]

lima and docker.lima recognizes $LIMA_INSTANCE to switch the instance name:

lima/cmd/lima

Line 14 in 88173f0

: "${LIMA_INSTANCE:=default}"

lima/cmd/docker.lima

Line 7 in 88173f0

: "${LIMA_INSTANCE:=docker}"

However, nerdctl.lima does not:

lima/cmd/nerdctl.lima

Line 4 in 88173f0

exec limactl shell --preserve-env default nerdctl "$@"

[afbjorklund]

It got broken here: 35d82ea

[Kim-Yukyung]

Hi! I'd like to try working on this issue if possible. Would it be okay to assign it to me?
Thank you!