Enable setting a list of image_pull_secrets (#860)

When there are e.g. multiple authenticated container registries used
we need to be able to add multiple imagePullSecrets to the k8s resource

Co-authored-by: Maximilian Meister <maximilian.meister@pm.me>

roles/backup/tasks/secrets.yml

@@ -21,9 +21,19 @@
     - ingress_tls_secret
     - ldap_cacert_secret
     - bundle_cacert_secret
-    - image_pull_secret
     - ee_pull_credentials_secret
 
+# image_pull_secret is deprecated in favor of image_pull_secrets
+- name: Dump image_pull_secret into file
+  include_tasks: dump_secret.yml
+  loop:
+    - image_pull_secret
+  when: image_pull_secret is defined
+
+- name: Dump image_pull_secrets into file
+  include_tasks: dump_secret.yml
+  loop: "{{ awx_spec.spec[image_pull_secrets] }}"
+
 - name: Nest secrets under a single variable
   set_fact:
     secrets: {"secrets": '{{ secret_dict }}'}