static-cms/website/content/docs/github-backend.md

title	weight	group
GitHub	20	accounts

For repositories stored on GitHub, the github backend allows CMS users to log in directly with their GitHub account. Note that all users must have push access to your content repository for this to work.

Because Github requires a server for authentication, Netlify facilitates basic GitHub authentication.

To enable basic GitHub authentication:

1. Follow the authentication provider setup steps in the Netlify docs.
2. Add the following lines to your Netlify CMS config.yml file:

backend:
  name: github
  repo: owner-name/repo-name # Path to your GitHub repository

Specifying a status for deploy previews

The GitHub backend supports deploy preview links. Netlify CMS checks the context of a commit's statuses and infers one that seems to represent a deploy preview. If you need to customize this behavior, you can specify which context to look for using preview_context:

backend:
  name: github
  repo: my/repo
  preview_context: my-provider/deployment

The above configuration would look for the status who's "context" is "my-provider/deployment".