The static methods in the new class
`eu.nebulouscloud.optimiser.kubevela.KubevelaAnalyzer` are used by
multiple components in the NebulOuS Solver.
Create a library `nebulous-requirements-extractor` that houses this
class.
Adapt the container build job to run at project root, not inside the
`nebulous-controller` subdirectory.
Add jobs for library build and repository upload.
Change-Id: Ic61c7064d216201031659bc362e3ed218f9c2b67
3f75c54bee