Support for relative path or env var in layout CWD

[t18n]

trafficstars

I have multiple computers and I wish that I can sync all the layouts. However, the one thing that prevent me from doing that is that cwd only supports absolute path.

# Computer A
layout {
    tab name="Dotfiles" cwd="/Users/User-A/dotfiles" {
             # pane config
        }
    }
}

# Computer B
layout {
    tab name="Dotfiles" cwd="/Users/User-B/dotfiles" {
             # pane config
    }
}

I would like to request support for relative path or env to make it easier to sync with dotfiles.

[scabala]

I think this is duplicate of #2035

[Nicoretti]

@scabala think so too. . @t18n, could you please review and close/update the ticket?

[t18n]

Duplicates https://github.com/zellij-org/zellij/issues/2035