[Feature Request] Allow running bash commands in the parent environment

**Is your feature request related to a problem? Please describe.**
I have certain environment variables defined in my shell that specify parameters for kicking off builds on a CI server. I would like to be able to implement this functionality in LazyGit so that I can kick off builds on specific hashes, but when LazyGit runs bash commands it does not preserve the parent environment variables, so my commands can't access them.

**Describe the solution you'd like**
I would like for there to be a way to run commands while preserving all (or even some specific) environment variables from the shell session that LazyGit is run in.

**Describe alternatives you've considered**
I can't think of any way to get around this that doesn't involve writing the data in the env vars to a file, which I cannot do (sensitive information)

Is this doable somehow already that I'm missing? If not, is this something that is possible to add?