chore: Migrate ingress-nginx from operator to ansible role

In addition, update docker_image filter to support digest output
diff --git a/playbooks/openstack.yml b/playbooks/openstack.yml
index e0ad7dd..95de1c9 100644
--- a/playbooks/openstack.yml
+++ b/playbooks/openstack.yml
@@ -40,6 +40,10 @@
       tags:
         - cert-manager
 
+    - role: ingress_nginx
+      tags:
+        - ingress-nginx
+
     - role: rabbitmq_cluster_operator
       tags:
         - rabbitmq-cluster-operator