[BUG] dreamfactorysoftware/df-base-img:ubuntu-22 does not exist

[tvarsis]

The update to version 5.0 references a new base image dreamfactorysoftware/df-base-img:ubuntu-22 that has not yet been created, hence docker build is giving errors:

manifest for dreamfactorysoftware/df-base-img:ubuntu-22 not found: manifest unknown: manifest unknown