Only allow squash merge

[thomasfrederikhoeck]

Description

Sometimes it appears that some PR are merged in with all the underlying commits which can create some noise on what was changed and it makes reverts harder. I believe squash merge should be enforced - I think this is the common way to go about for a lib like delta-rs.

https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges/configuring-commit-squashing-for-pull-requests

Use Case

Related Issue(s)

[ion-elgreco]

I think the default is squash and merge, but you can still select rebase and merge. Not sure why that sometimes is selected though

[thomasfrederikhoeck]

@ion-elgreco I think it is possible to disable all other kinds if you are the repo owner. I think that should be considered since right now commits on master (if not squash) doesn't directly link to PRs.