workflows-build: utilize buildbots instead of runners

[KexyBiscuit]

Rationale

Build packages on AOSC OS virtual machines and bare metal devices enables the usage of ciel and other existing tools, eliminating the needs of reimplementing the same feature set in both Project Cake and existing toolchain and to ensure feature parity between them. Also, this enables CI/CD on all architectures instead of just what public services provides. This supersedes #3524.

Goals

• [ ] Investigate ciel headless usage
• [ ] Implement a new workflow using ciel on buildbots over network
• [ ] Repurpose existing workflow as agile validation tool

Non-Goals

• Implement new features for ciel