Allow service account impersonation
This MR adds the ability to use service account impersonation to this tool.
Part of https://gitlab.developers.cam.ac.uk/uis/devops/infra/sql-backup/-/issues/19
This MR adds the ability to use service account impersonation to this tool.
Part of https://gitlab.developers.cam.ac.uk/uis/devops/infra/sql-backup/-/issues/19