ci: set skopeo CI branch

We need to test against the older skopeo not the latest one.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

Author: Luap99

hack/ci/runner.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-SKOPEO_CI_BRANCH=main
+SKOPEO_CI_BRANCH=release-1.22
 
 # This script is only intended to be run inside the Lima VM to configure it and start the tests.
 # Do not run locally.