Cirrus: Use images from automation_images

Previously, VM Images were built from a side-band process tacked onto
containers/podman automation. This has recently been split off into it's
own repository containers/automation_images. This PR makes use of
freshly built images produced using the new workflow. Additionally, to
support testing of a runc -> crun transition, both packages are
installed in the newly referenced images.

Signed-off-by: Chris Evich <cevich@redhat.com>

.cirrus.yml

@@ -11,12 +11,12 @@ env:
     HOME: "/root"  # not set by default
     GOCACHE: "${HOME}/.cache/go-build"
 
-    # VM Images are maintained in the libpod repo.
-    _BUILT_IMAGE_SUFFIX: "libpod-6508632441356288"
-    FEDORA_CACHE_IMAGE_NAME: "fedora-31-${_BUILT_IMAGE_SUFFIX}"
-    PRIOR_FEDORA_CACHE_IMAGE_NAME: "fedora-30-${_BUILT_IMAGE_SUFFIX}"
-    UBUNTU_CACHE_IMAGE_NAME: "ubuntu-20-${_BUILT_IMAGE_SUFFIX}"
-    PRIOR_UBUNTU_CACHE_IMAGE_NAME: "ubuntu-19-${_BUILT_IMAGE_SUFFIX}"
+    # VM Images are maintained in the automation_images repo.
+    _BUILT_IMAGE_SUFFIX: "c6110627968057344"
+    FEDORA_CACHE_IMAGE_NAME: "fedora-${_BUILT_IMAGE_SUFFIX}"
+    PRIOR_FEDORA_CACHE_IMAGE_NAME: "prior-fedora-${_BUILT_IMAGE_SUFFIX}"
+    UBUNTU_CACHE_IMAGE_NAME: "ubuntu-${_BUILT_IMAGE_SUFFIX}"
+    PRIOR_UBUNTU_CACHE_IMAGE_NAME: "prior-ubuntu-${_BUILT_IMAGE_SUFFIX}"
 
     # Must be defined true when testing w/in containers
     CONTAINER: "false"