[WIP] automatically add to path

[ianchen-tw]

Fix: pyenv#112

For users using the installation script, it is natural that the environment variables will be automatically modified

Outline

• Modify user's profile based on current shell & system(bash & zsh, currently)

Discussion:

• Should we add an environment variable, so that users can choose not to modify their shell config profiles?

References

• https://github.com/nvm-sh/nvm#install--update-script
• https://github.com/ofek/userpath
• wrong shell ofek/userpath#3

[ianchen-tw]

offline installer 當下的行為跟一般的installer 不太相同，且對應的打包腳本無法正確 clone 專案。
初步看起來是使用的協定現在已經不支援 (https://github.blog/2021-09-01-improving-git-protocol-security-github/)
這個內容留到下次 PR 再發