Use relatedImages to make disconnected deployments possible

* Add ability to pass images in from the CSV for disconnected installs

Signed-off-by: Christian M. Adams <chadams@redhat.com>

roles/backup/templates/management-pod.yml.j2

@@ -13,7 +13,7 @@ metadata:
 spec:
   containers:
   - name: {{ ansible_operator_meta.name }}-db-management
-    image: "{{ postgres_image }}:{{ postgres_image_version }}"
+    image: "{{ _postgres_image }}"
     imagePullPolicy: Always
     command: ["sleep", "infinity"]
     volumeMounts: