Use auth file instead of creds in quadlet files

roles/service/defaults/main.yaml

@@ -27,7 +27,3 @@ service_additional_containers: []
 service_requires: []
 service_wants: []
 service_auto_update: true
-
-service_container_image_creds:
-  username: ""
-  password: ""

roles/service/meta/argument_specs.yaml

@@ -66,22 +66,6 @@ argument_specs:
         description: "The image to run in the service container(s), in FQIN format (registry/imagename:tag)."
         type: str
         required: true
-      service_container_image_creds:
-        description: Credentials used to authenticate with the registry
-        type: dict
-        required: false
-        default:
-          username: ""
-          password: ""
-        options:
-          username:
-            description: Username
-            type: str
-            required: true
-          password:
-            description: Password
-            type: str
-            required: true
 
       service_container_user:
         description: The UID to run as inside the container

roles/service/tasks/additional.yaml

@@ -5,7 +5,6 @@
   vars:
     container_name: "{{ _service_additional_container.name }}"
     container_image: "{{ _service_additional_container.image | default(service_container_image) }}"
-    container_image_creds: "{{ service_container_image_creds }}"
     container_command: "{{ _service_additional_container.command | default([]) }}"
     container_user: "{{ service_container_user }}"
     container_mounts: "{{ _service_additional_container_mounts }}"

roles/service/tasks/main.yaml

@@ -28,7 +28,6 @@
   vars:
     container_name: "{{ service_name }}"
     container_image: "{{ service_container_image }}"
-    container_image_creds: "{{ service_container_image_creds }}"
     container_command: "{{ service_container_command }}"
     container_user: "{{ service_container_user }}"
     container_mounts: "{{ _service_container_mounts }}"