FEDX-973 Remove Workiva Build files

[robbecker-wf]

Summary

Removes the Dockerfile and skynet.yaml files .... internal files that are not needed since CI is handled by Github Actions

Testing

• [ ] CI passes

[aviary2-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure

• Verify aviary.yaml coverage of security relevant code

  Questions or Comments? Reach out on Slack: #support-infosec.