Update Mattermost to 5.38.2
What does this MR do?
Big features in Mattermost 5.38 include a new onboarding flow and some changes for leading up to Mattermost 6.0 (which has been moved back to an October release so GitLab will get it in November). It's also the first version that will work with the Focalboard plugin out of the box, and there's some minor security fixes. The full changelog is here.
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
Expected (please provide an explanation if not completing)
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Test plan indicating conditions for success has been posted and passes -
Documentation created/updated -
Tests added -
Integration tests added to GitLab QA -
Equivalent MR/issue for the GitLab Chart opened