Allow custom MR links for changelog entries
What does this MR do?
This adds support for specifying a custom merge request link for changelogs, using the trailer "MR". While the value can technically be both a link and a Markdown reference, I strongly suggest we use regular links. Regular links are easier to work with from the terminal, and will work across mirrors (unlike short references such as !123 (merged)).
Related issues
gitlab-com/gl-infra/delivery#1551 (closed)
Checklist
See Definition of done.
For anything in this list which will not be completed, please provide a reason in the MR discussion
Required
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Merge Request Title, and Description are up to date, accurate, and descriptive -
MR targeting the appropriate branch -
MR has a green pipeline on GitLab.com -
Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks -
trigger-package
has a green pipeline running against latest commit