Set default images, but use them as a last resort

* Only use them if user did not set an image, or RELATED_IMAGES_ var
    is not set

Signed-off-by: Christian M. Adams <chadams@redhat.com>
(cherry picked from commit bb957be9e6)

roles/restore/tasks/init.yml

@@ -71,6 +71,10 @@
     force: true
     wait: true
 
+- name: Set default postgres image
+  set_fact:
+    _default_postgres_image: "{{ _postgres_image }}:{{_postgres_image_version }}"
+
 - name: Set user provided postgres image
   set_fact:
     _custom_postgres_image: "{{ postgres_image }}:{{ postgres_image_version }}"
@@ -80,7 +84,7 @@
 
 - name: Set Postgres image URL
   set_fact:
-    _postgres_image: "{{ _custom_postgres_image | default(lookup('env', 'RELATED_IMAGE_AWX_POSTGRES')) }}"
+    _postgres_image: "{{ _custom_postgres_image | default(lookup('env', 'RELATED_IMAGE_AWX_POSTGRES'))  | default(_default_postgres_image) }}"
 
 - name: Create management pod from templated deployment config
   k8s:

roles/restore/vars/main.yml

@@ -1,8 +1,8 @@
 ---
 
 deployment_type: "awx"
-postgres_image: postgres
-postgres_image_version: 12
+_postgres_image: postgres
+_postgres_image_version: 12
 
 backup_api_version: '{{ deployment_type }}.ansible.com/v1beta1'
 backup_kind: 'AWXBackup'