[qa][ops] Light-weight guest image for UEFI boot and secure boot

Hi, I've been trying to implement a few tempest tests to verify functionality of UEFI boot and secure boot, and I noticed that cirros, which is used as a primary guest image for tests, do not support UEFI boot. I'm wondering if anyone can share a good light-weight guest image used in their own tests of these features ? I guess that ubuntu guest image might be a primary choice (given the fact that ubuntu is the default operating system for tests) but I'm wondering if we have more light-weight one. Thank you, Takashi -- Takashi Kajinami irc: tkajinam github: https://github.com/kajinamit launchpad: https://launchpad.net/~kajinamit