Switch to using nightly images

Author: ehelms

src/vars/images.yml

@@ -6,7 +6,7 @@ postgresql_registry_auth_file: "{{ registry_auth_file }}"
 pulp_registry_auth_file: "{{ registry_auth_file }}"
 redis_registry_auth_file: "{{ registry_auth_file }}"
 
-container_tag_stream: "3.18"
+container_tag_stream: "nightly"
 candlepin_container_image: quay.io/foreman/candlepin
 candlepin_container_tag: "foreman-{{ container_tag_stream }}"
 foreman_container_image: quay.io/foreman/foreman