Feature Request: Allow providing macOS password via environment variable for CI support

[wei18]

🙏 Request Summary

First of all, thank you for maintaining xcodes — it's an incredibly helpful tool for managing Xcode versions both locally and in CI environments.

I’m currently using xcodes in a self-hosted CI runner and ran into a limitation with the --select command, which requires superuser privileges. The current implementation prompts for a password interactively:

xcodes/Sources/XcodesKit/XcodeSelect.swift

Lines 135 to 141 in 938adbc

	let passwordInput = {
	Promise<String> { seal in
	Current.logging.log("xcodes requires superuser privileges to select an Xcode")
	guard let password = Current.shell.readSecureLine(prompt: "macOS User Password: ") else { seal.reject(XcodeInstaller.Error.missingSudoerPassword); return }
	seal.fulfill(password + "\n")
	}
	}

✨ Feature Proposal

Would it be possible to enhance this behavior by optionally allowing the password to be provided via an environment variable — for example:

export XCODES_SUDO_PASSWORD=your_password

When this variable is set, xcodes could use its value instead of prompting interactively.

✅ Benefits

This would be extremely useful in non-interactive environments such as:

• GitHub Actions
• Self-hosted CI runners
• Local automation scripts
  It would allow full automation of xcodes install --select without manual intervention.