feature request: add comments to gitlab issues when patch commit message/cover letter has a Resolves: tag

[pm215]

Now we've switched to gitlab for issue tracking for QEMU, we use the Resolves: tag in commit messages to have gitlab automatically close an issue when the patch fixing it is commited upstream. It would be nice if patchew also supported this. At the moment I have to:

• post a series to the mailing list
• wait 5 to 15 minutes for it to arrive at patchew and the web page to update
• add a comment to the gitlab issue saying "Posted a patch for this: [patchew URL]"

If patchew could also recognize the Resolves: tag and update the gitlab issue that would save me doing this (of which the most irritating part is the "wait" step, which means I can't just mentally move on to the next thing I want to work on because I still have a thing-to-be-done associated with the previous patch).

There might need to be some per-project configuration to make it opt-in and to restrict which gitlab projects we permit patchew to update.