[FEATURE REQUEST] GitHub Provider/Repository Merge Configuration

[hashibot]

This issue was originally opened by @pantocrator27 as hashicorp/terraform#14678. It was migrated here as part of the provider split. The original body of the issue is below.

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In managing GitHub repositories, it seems that for repository, you can manage the types of merges you support via PRs such as "merge commits", "squashing merging" & "rebase merging". It would be nice if the GitHub provider supported these as well.

[ghost]

https://github.com/terraform-providers/terraform-provider-github/pull/1

[ghost]

As a result of the above PR, this issue can be considered resolved

[grubernaut]

thanks @pantocrator27, solved via #1