Release checklist

This is for people releasing at Haufe.

Run set-version.sh if that hasn't been done yet to update all versions on the next branch
Make sure all builds have run successfully, including tests, on branch next
Use merge-next.sh to merge changes to `master``
Make sure all builds have run successfully, including tests, on branch master
Write release notes on wicked.haufe.io/next for the new version
Run merge-next --docs to merge the documentation to master
Run release-github.sh
Run pull-docker-push-haufe.sh to propagate the images to registry.haufe.io

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