Refactor Build Stage

We need to continue the work we did for #600 (closed) for the following scan reports

• Twistlock CVE
• Anchore Compliance
• Openscap Compliance

Skipping this work (above) until #635 (closed) is complete. Additional info in comment below.

This ticket will be repurposed to refactor the build stage.

• Write python wrappers for containerization tools
  • Skopeo and buildah
• Replace shell script with python

Considerations:

• Look at rest of code base for shared resources
  • ex. Image class in upload_to_harbor.py