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• I'd be willing to implement this feature (contributing guide)

Describe the user story
As an engineer, I'd like all of my automerged atlantis PRs to use the squash merge method without having to specify a flag on every atlantis apply command.

Describe the solution you'd like
I'd love to be able to set the automerge method alongside the automerge enabled/disabled flag in atlantis.yaml

An ideal configuration in the atlantis.yaml would look like:

version: 3
automerge: true
automerge-method: squash
projects:
  ...

Right now it's possible to set the --auto-merge-method flag on an atlantis apply command when automerge: true. It would be awesome to be able to set the automerge-method in the repo file so every atlantis apply uses that method. Our use case here is enforcing squash commits to our main branch, but atlantis automerging currently fails because the default merge method isn't allowed. This results in this error:

Automerging failed:

merging pull request: PUT https://api.github.com/repos/FigureTechnologies/figure-infra/pulls/530/merge: 405 Merge commits are not allowed on this repository. []