Custom environment variables when running commands #718

Is it possible to set custom environment variables when the agent runs commands?
My project uses turborepo, but its TUI seems to conflict with OpenCode's UI (see the image below).
I would like to have a configuration option that allows injecting environment variables when the agent executes commands.
For example, setting TURBO_UI=0 disables Turborepo's TUI and should resolve the issue.