How can I have github do PR merges with a specific email/user info?

Question

I have the following situation. At github I have two email address: stefano@home and stefano@work. My github account is configured for stefano@home to be the primary address. At work, I correctly set up my git checkouts to create commits with stefano@work. However, when I go to github and merge PRs onto work's repos, my merge commits appear with stefano@home address.

How can I say that all PR merges on that specific repo must have stefano@work?

Answer 1

Merging from the GitHub UI always used the primary email address on your account, ...
But, since April 24th 2019 (4 years later):

"Choose your merge commit email"

You can now choose the author email for commits created when merging pull requests via the web.
As a reminder, you can also choose the author email for web-based edits.

For more information, see merging a pull request.

Answer 2

Merging from the GitHub UI always uses the primary email address on your account, or the private @users.noreply.github.com version if you've checked that box. If you want to use different emails per repository, you'll have to git merge from the command line. GitHub will still close the PR properly.