TiddlyWiki can save changes directly to a GitHub repository in the single file configuration.

Saving to a Git service is configured in the $:/ControlPanel in the Git Service Saver tab under the Saving tab. The following settings are supported:

• Type - (mandatory) the type of the service (e.g. GitHub, GitLab)
• Username - (mandatory) the username for the Git service account used for saving changes
• Password - (mandatory) the OAUTH token or personal access token for the specified account. Note that GitHub deprecated password authentication, permitted authentication methods are shown in the API documentation.
• Repository - (mandatory) the name of the Git repository. Both the owner name and the repository name must be specified. For example Jermolene/TiddlyWiki5
• Branch - (optional) the name of the branch to be used within the Git repository. Defaults to main (GitHub) or master (GitLab)"
• Path - (optional) the path to the target file. Defaults to /
• Filename - (mandatory) the filename of the target file

Notes

• The Git service token or password is stored persistently in browser local storage. Be sure to clear the password if using a shared machine. Using a personal access token for authentication offers an extra layer of security: if the access token is accidentally exposed it can be revoked without needing to reset the account password

For a more detailed info about the GitHub saver see: GitHub Saver Tutorial by Mohammad