Always execute DB update

Running the db update as part of the helm install prevents downtime and confusion for upgrades or for migration mistakes. As it does not introduce a changing decision or risk then it does not need control via a variable

Use cases:

• When upgrading wordpress, a db-update must be authorised by cli or by logged-in user
• When migrating, imprecise decisons about drop-tables, locale or version can trigger a db update confirmation loop