Add option to change title of merge

[VildeBrobacke]

Currently when automerging a PR that only has one commit, the title of the merge will be the title of that commit. While automerging a PR that has multiple commits the title of the merge will be the same as the title of the PR.

Using MERGE_COMMIT_MESSAGE the merge description can be changed, either having this also change the title of the merge, or having something like MERGE_COMMIT_TITLE would be great for consistency.

[pascalgn]

Currently when automerging a PR that only has one commit, the title of the merge will be the title of that commit. While automerging a PR that has multiple commits the title of the merge will be the same as the title of the PR.

Which behaviour do you not like? The one with one commit or the one with multiple commits? Or rather, what's the behaviour you want? The MERGE_COMMIT_MESSAGE option will change title and description (title is always the first line of the commit message)

[VildeBrobacke]

The behavior I would want is for the title to always be the title of the PR regardless of the amount of commits, and using MERGE_COMMIT_TITLE does not seem to let me do this.

On a PR with only 1 commit;
MERGE_COMMIT_MESSAGE: "{pullRequest.title} (#{pullRequest.number})\n{pullRequest.body}"
gives me this result:

Where instead I would expect this result:

[VildeBrobacke]

@pascalgn Bump

[pascalgn]

Sorry for not getting back to you sooner! This should actually be working already, did you try setting MERGE_COMMIT_MESSAGE: "pull-request-title"?

[VildeBrobacke]

It does not seem to be giving the result I'm after

From these results it seems to me that MERGE_COMMIT_MESSAGE doesn't affect the actual title but rather only the description of the merge message

[VildeBrobacke]

@pascalgn bump

[pascalgn]

I don't use this feature myself, so I won't have time to look into this. But if you create a PR, I will look at it as soon as possible! 🙏