Move external_container_reg to earlier stage

[danlester]

Fixes #1052

Changes:

Move external_container_reg Terraform sections from stage 08 to stage 03.

Types of changes

What types of changes does your code introduce?

Put an x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features to not work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

Requires testing

• Yes
• No

In case you checked yes, did you write tests?

• Yes
• No

[costrouc]

@danlester makes sense. Since I remember you will need a custom keycloak image etc. Thanks for catching this.