With vterm, Julia REPL does not recognize environment variables of the buffer

[rc-zb]

Description

With the vterm backend, Julia REPL can't recognize the environment variables set per-buffer, like JULIA_PROJECT.

Reproduction

1. Install Emacs-libvterm.
2. Install julia-snail.
3. Install envrc.el and set the env var JULIA_PROJECT via Direnv.
4. Open a .jl file. The echo area shows that the env vars have been successfully set.
5. Open an REPL with julia-snail.
6. Press ] to see the project being a wrong one.
7. Back to the normal REPL and enter ENV["JULIA_PROJECT"] to confirm the fact.

Workaround

Wrap julia-snail with inheritenv-add-advice from inheritenv, like this:

(inheritenv-add-advice 'julia-snail)

Possible solution

inheritenv provides a couple of tools for dealing with this
issue:

1. Library authors can wrap code that plans to execute processes in
   temporary buffers with the inheritenv macro.
2. Users can modify commands like shell-command-to-string using the
   inheritenv-add-advice macro.