test(authorizer): Allow custom images for OPA

Author: NickLarsenNZ

tests/templates/kuttl/authorizer/02-install-opa.yaml.j2

@@ -29,7 +29,12 @@ metadata:
   name: test-opa
 spec:
   image:
+{% if test_scenario['values']['opa'].find(",") > 0 %}
+    custom: "{{ test_scenario['values']['opa'].split(',')[1] }}"
+    productVersion: "{{ test_scenario['values']['opa'].split(',')[0] }}"
+{% else %}
     productVersion: "{{ test_scenario['values']['opa'] }}"
+{% endif %}
     pullPolicy: IfNotPresent
 {% if lookup('env', 'VECTOR_AGGREGATOR') %}
   clusterConfig: