CLI requires $HOME variable

### Describe the Bug

CLI failed to start if `$HOME` environment variable is not set:
```
[pangolin-cli] failed to get home directory: $HOME is not defined
```
OLM don't have such problem. 


### Environment

- Client Version: 0.5.1


### To Reproduce

Unset $HOME environment before pangolin-cli call.

### Expected Behavior

Machine like environments must not have dependency on $HOME.