chore: enhance west command with safety check for init

[prdktntwcklr]

Summary

After cloning the ZMK repository, developers must run west init with the -l app/ option to correctly specify the local manifest repository (see docs). Omitting this option results in Zephyr being initialized in the wrong directory, leading to a misconfigured environment that is cumbersome and error-prone to clean up.

This PR introduces a safety check to the west command by modifying the .bashrc inside the devcontainer. The modification ensures that when running west init, users are reminded to include the -l app/ option, unless explicitly overridden.

Key Changes

If west init is run without the -l option, a warning message is displayed giving the user the option to bypass the check if needed:

root@c97ed173883e:/workspaces/zmk# west init
STOP: Are you sure you don't want 'west init -l app/'?
Run 'command west init' if you really meant it.

PR check-list

• Branch has a clean commit history
• Additional tests are included, if changing behaviors/core code that is testable.
• Proper Copyright + License headers added to applicable files (Generally, we stick to "The ZMK Contributors" for copyrights to help avoid churn when files get edited)
• Pre-commit used to check formatting of files, commit messages, etc.
• Includes any necessary documentation changes.