Add 'remoteUserHome' variable to devcontainer-feature.json

[samruddhikhandale]

Scenario - In devcontainer-feature.json I’d like to do update the containerEnv.PATH as follows 👇

"containerEnv": {
    "PATH": "${remoteUserHome}/.local/bin:${PATH}"
}

where the remoteUserHome can be /root or /home/userName depending upon the remote user. Currently, I am not able to add the following to the PATH because the remote user is dynamic and hardcoding wouldn't work.

As remoteUserHome is available during running feature scripts, I wonder if they could be available when the containerEnv merge logic is implemented?

I also tried to add ~/.local/bin to the PATH, however, that doesn't work if a shell is not invoked. Hence, doesn't help in my scenario.

[samruddhikhandale]

If _REMOTE_USER_HOME could be made available for mounts as well, then it could help solve devcontainers/features#384

[chrmarti]

We could add ${remoteUserHome} (and similar variables). (This would align more with what we already have than environment variables.)

[samruddhikhandale]

We could add ${remoteUserHome} (and similar variables). (This would align more with what we already have than environment variables.)

Make sense, updated the issue!