RFW: Setting for GitHub PR auto-merge

[davegaeddert]

A new setting can be added called github_automerge. This would enable (or disable) the auto-merge option on a PR after it is created (or updated). At this point, it would need to use the GraphQL API because auto-merge isn't a part of the REST API yet:
https://docs.github.com/en/graphql/reference/mutations#enablepullrequestautomerge

The end of this function would be the place to start:

deps/internal/pullrequest/github/main.go

Line 164 in 8d4fa0c

func (pr *PullRequest) CreateOrUpdate() error {

I don't think a GraphQL library/dependency is needed.

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