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

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

[robbecker-wf]

QA+1 CI passes

[greglittlefield-wf]

+10

[greglittlefield-wf]

@Workiva/release-management-p

[rmconsole-wf]

+1 from RM