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Allow vault cooking from the UI

vlorentzrequested to merge
generated-differential-D7120-source into master

The vault is now about as stable as it can be in the short term, so I think it is time to finally make this available to everyone, without having to go throught the API manually.

Closes T3504. Depends on swh/infra/sysadm-environment#3918 (closed).

Migrated from D7120 (view on Phabricator)

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