Fixes #29567 - Add nulldb for build environments

Fixes #28539 - Drop smart variables from DB

Fixes #29520 - use Arel where needed to wrap SQL

Fixes #29452 - fk migrations cleanup

Fixes #29464 - plain inputs can be hidden

Some inputs can be sensitive. Users typing such values would prefer to
have the value hidden in the form. The sensitive information can be a
password, private key or general multiline text. Therefore we aren't
limitting the input to type=password, but use text area with hiding...

fixes #29432 - add flatcar os support

Fixes #29386 - fix setting_type for oidc_audience

Fixes #27067 - Patch for External IPAM plugin implementation

Fixes #29349 - Fix Layout/SpaceInsideArrayLiteralBrackets cop

Fixes #19896 - Fix Style/RedundantSelf cop