Add --user flag support for wp-env

[Luc45]

What problem does this address?

Running wp-env in Linux is annoying because it creates files with user 0:0 (root).

What is your proposed solution?

One possible solution is to add:

const os = require("os");

const composeCommand = [
	'-u',
	os.userInfo().uid,
];

Here: https://github.com/WordPress/gutenberg/blob/trunk/packages/env/lib/commands/run.js#L52-L59 (right before or after the --rm array value, as -u is a flag of run)

Effectively running the docker command as the user running wp-env.

Another possibility is making this an optional behavior, since it affects mostly Linux users, as the VM for Docker Desktop for Mac and Windows takes care of UID mapping.

[kopepasah]

I too would like this feature, as we are developing a CI/CD pipeline with @wordpress/env, and using a wp-env command is more intuitive that running docker-compose directly.