Refactored operation's retrieve_workspace() to first pick best auth option based on env vars defined and then pick workspace retrieval method (try config file first, then by name).
Removed SP auth option from src's retrieve_workspace() - we were not using it.
Also defined VM_VERSION var in aml vars yaml file to pin ubuntu version as we are doing with the Python & SDK versions.
Closes #52
retrieve_workspace()to first pick best auth option based on env vars defined and then pick workspace retrieval method (try config file first, then by name).retrieve_workspace()- we were not using it.VM_VERSIONvar in aml vars yaml file to pin ubuntu version as we are doing with the Python & SDK versions.