Creating staging and production versions of a site on Github Pages

Question

I want to use Github Pages to publish a production website (at, say, www.example.com) and also a staging version of the same site (at, say, staging.example.com).

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Answer 1

Pulled from comments above:

[M]erge the staging git branch into the production branch and push[.] You could just keep the CNAMEs permanently pointing to their respective repos, but manipulate the repos separately.

Comment originally by Jonathan Chan

Do as @JonathanChan says: maintain two separate branches, then hijack your CNAME file in each one. This way local changes (to the CNAME) will not be committed to the repository.