Simplify podman calls in CI steup

Ubuntu 24.04 ships podman v4 which fixes a v3 issue
on loading images. With v4 loaded images keep the
image name if present.

Signed-off-by: David Cassany <[email protected]>

Author: davidcassany

scripts/run_registry.sh

@@ -41,11 +41,9 @@ function push {
     # Ugly hack around podman to circumvent the need of adding insecure registries
     # at /etc/docker/daemon.json when using the docker client 
     docker save "${img}" | podman load
-    tag=${img##*:}
-    imgID=$(podman images -n | grep "${tag}" | awk '{print $3}' | head -n1)
-    podman tag "${imgID}" "${reg_img}"
+    podman tag "${img}" "${reg_img}"
     podman push --tls-verify=false "${reg_img}"
-    podman rmi -f "${imgID}"
+    podman rmi -f "${img}"
   done
 }