Fix incorrect variable name for promote-docker-image

The variable was changed inside the role from image to zj_image but the
included task file did not use the new variable name.  This patch fixes
this.

Change-Id: Ibe3acbd0881da24ec9c2f636d777885a309bdf98

roles/promote-docker-image/tasks/promote-cleanup.yaml

@@ -1,6 +1,6 @@
 - name: List tags
   uri:
-    url: "https://hub.docker.com/v2/repositories/{{ image.repository }}/tags?page_size=1000"
+    url: "https://hub.docker.com/v2/repositories/{{ zj_image.repository }}/tags?page_size=1000"
     status_code: 200
   register: tags
 - name: Set cutoff timestamp to 24 hours ago
@@ -13,7 +13,7 @@
     loop_var: zj_docker_tag
   when: zj_docker_tag.last_updated < cutoff.stdout and zj_docker_tag.name.startswith('change_')
   uri:
-    url: "https://hub.docker.com/v2/repositories/{{ image.repository }}/tags/{{ zj_docker_tag.name }}/"
+    url: "https://hub.docker.com/v2/repositories/{{ zj_image.repository }}/tags/{{ zj_docker_tag.name }}/"
     method: DELETE
     status_code: [200,204]
     headers:

roles/promote-docker-image/tasks/promote-retag-inner.yaml

@@ -1,7 +1,7 @@
 - name: Get manifest
   no_log: true
   uri:
-    url: "https://registry.hub.docker.com/v2/{{ image.repository }}/manifests/change_{{ zuul.change }}_{{ image_tag }}"
+    url: "https://registry.hub.docker.com/v2/{{ zj_image.repository }}/manifests/change_{{ zuul.change }}_{{ image_tag }}"
     status_code: 200
     headers:
       Accept: "application/vnd.docker.distribution.manifest.v2+json"
@@ -11,7 +11,7 @@
 - name: Put manifest
   no_log: true
   uri:
-    url: "https://registry.hub.docker.com/v2/{{ image.repository }}/manifests/{{ image_tag }}"
+    url: "https://registry.hub.docker.com/v2/{{ zj_image.repository }}/manifests/{{ image_tag }}"
     method: PUT
     status_code: 201
     body: "{{ manifest.content | string }}"
@@ -21,7 +21,7 @@
 - name: Delete the current change tag
   no_log: true
   uri:
-    url: "https://hub.docker.com/v2/repositories/{{ image.repository }}/tags/change_{{ zuul.change }}_{{ image_tag }}/"
+    url: "https://hub.docker.com/v2/repositories/{{ zj_image.repository }}/tags/change_{{ zuul.change }}_{{ image_tag }}/"
     method: DELETE
     status_code: [200,204]
     headers:

roles/promote-docker-image/tasks/promote-retag.yaml

@@ -7,7 +7,7 @@
     force_basic_auth: true
   register: token
 - name: Retag image
-  loop: "{{ image.tags | default(['latest']) }}"
+  loop: "{{ zj_image.tags | default(['latest']) }}"
   loop_control:
     loop_var: image_tag
   include_tasks: promote-retag-inner.yaml