Using --env for nerdctl doesn't pass through current environment values

I'm unsure if this is expected behaviour or not, I was attempting to replace `docker` with `nerdctl.lima` on Mac OSX (M1) and almost all other runtime options seem to work the same, so seemed a bit odd that this one doesn't quite get there. Feel free to close if it's expected behaviour.

```
#-❯ export FOO=bar

#-❯ echo $FOO
bar

#-❯ nerdctl.lima run --rm -it -e FOO ubuntu bash
root@4b71f410d6a4:/# echo $FOO

```

vs

```
#-❯ nerdctl.lima run --rm -it -e FOO=baz ubuntu bash
root@1697d3d01eac:/# echo $FOO
baz
```

When using docker, usage of `-e FOO` with no value, would pass through whatever it is in the current environment. Perhaps it's a problem with `lima` not passing through the current environment to the linux VM on mac OS. Perhaps this is expected behaviour of native `nerdctl`? I'll move this issue over to there if that's the case.

FWIW- I'm using the `default` VM that came with `brew install lima`. Perhaps there is a way to configure it so the entire current ENV vars are always pushed through the SSH?