FEDX-819 Finish Github Actions transition

[robbecker-wf]

Summary

Finish the Github Action transition by removing Dockerfile, skynet.yaml and generating an SBOM

QA

• 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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[robbecker-wf]

QA+1 CI passes and sbom is attached @Workiva/release-management-p

[rmconsole-wf]

+1 from RM