Describe the feature or problem you’d like to solve

The settings for a project allow the merge methods associated with the Merge button to be limited to a subset of the three options

• Allow merge commits
• Allow squash merging
• Allow rebase merging

When merging through gh pr merge, you are presented with a list of all three options regardless.

Proposed solution

It would be nice if the options were limited to only the ones supported by the project. To take it one step further, if only one of the options is supported, the question should be skipped entirely.