chore: draft branch notoriously lagging behind

[lukpueh]

We've done a good job at automating most of the release management rules. One chore that remains to be done manually, and, as a consequence, is usually forgotten, is:

Merges with 'master' must be followed by a rebase of 'draft' onto 'master'.

Let's find a better (automatied) way to keep draft in-sync with master.