Vault: Migrate vault infrastructure to azure

Except for cooking tasks (running on azure), the remaining services runs on the unibo infra (node: orangerie):

• db (postgresql: swhvault)
• api (gunicorn-swh-vault)
• cache (gunicorn-swh-objstorage)

As the db is not that big, it can be moved to prado's secondary cluster.

Other services can move to a dedicated azure vm.

For the objstorage, the following should be enough:

• Performance/Access tier: Standard/Cold
• Replication: Locally-redundant storage (LRS)
• Account kind: BlobStorage

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Migrated from T1716 (view on Phabricator)