Add long installing options, add env file providing on install, add --print-env option

[yungwine]

No description provided.

[Copilot]

Pull Request Overview

This PR refactors the installation script to support long-form command line arguments and improves environment variable handling. The changes move from direct environment variable access to a centralized configuration approach using a CONFIG dictionary.

• Adds support for long-form command line arguments (e.g., --config, --mode) alongside existing short forms
• Introduces environment file support via --env-file option
• Refactors environment variable handling from direct os.environ access to a centralized CONFIG dictionary

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
scripts/install.sh	Adds long-form argument parsing and environment file support
scripts/install.py	Refactors environment variable handling to use CONFIG dictionary
mytoninstaller/settings.py	Updates to use buffer attributes instead of direct environment variable access
mytoninstaller/mytoninstaller.py	Centralizes environment variable initialization in init_envs function

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