Test Build Stage changes

Background

Before merging !1014 (closed), we should thoroughly test these changes against a variety of images, and ensure all existing unit tests are fixed/updated.

Acceptance Criteria

• Pipelines have successfully run for the following images
  • ubi8
  • ubi7
  • goproxy
  • pypi
  • npm
  • ubuntu20
  • distroless/static
  • scratch
  • an image based off of ubi
  • some multi layered image
  • some large image (same as multi layered)
• Testing has been performed for the following cases
  • Build cannot complete due to an invalid configuration or step in the dockerfile
  • Image cannot be pulled because it does not exist not important since base_image_validation will fail anyways
  • Image needs to be pulled from staging
  • Multiple branch tests
    • master
    • development
    • feature

Definition of Done

• Project pipeline runs successfully
• Code review completed and merge request approved/merged
• All Acceptance Criteria have been completed