Update IronBank BASE_IMAGE with ironbank prefix (#102720) (#102837)

This supports local testing.  It should not be included in
hardening_manifest.yml, which injects the scope at runtime.

Co-authored-by: Jon <[email protected]>

Author: mark-vieira

distribution/docker/src/docker/Dockerfile

@@ -21,7 +21,7 @@
 
 <% if (docker_base == 'iron_bank') { %>
 ARG BASE_REGISTRY=registry1.dso.mil
-ARG BASE_IMAGE=redhat/ubi/ubi9
+ARG BASE_IMAGE=ironbank/redhat/ubi/ubi9
 ARG BASE_TAG=9.2
 <% } %>