Maintain container and VM Incus images in parallel
Container and VM images are useful for different things; I use both
regularly. However, if you create one of them for a given release using
autopkgtest-build-{lxd,incus}
, it cleans up any existing image for the
other.
This commit makes better use of the {lxd,incus} image list
command
line, and restricts cleanup to images of the same type.