Codespaces can install dotfiles from any repo

Dotfiles are a common way to specify custom, user-specific behavior for applications (like Vim or Emacs) and shells on your codespaces. If enabled, dotfiles stored in a user's public dotfiles repository would be used for this configuration. With this change, any user owned repo, including private repos, can be used to install dotfiles into your codespaces.

For more information, see "Dotfiles".