container: work in check mode

roles/container/tasks/image.yml

@@ -29,13 +29,27 @@
 
 - name: Set container_image variable
   set_fact:
-    container_image: "{{ item }}"
+    container_image: "{{ item.image }}"
   when: item.skipped is not defined or not item.skipped
   loop:
     - "{{ built_image }}"
     - "{{ pulled_image }}"
 
+- name: Check mode image info
+  when: ansible_check_mode
+  block:
+    - name: Get docker image info for check mode
+      docker_image_info:
+        name: "{{ ('local_' + docker_service) if dockerfile is defined and dockerfile | length > 0 else docker_image }}"
+      register: existing_image
+
+    - name: Set check nmode container_image variable
+      set_fact:
+        container_image: "{{ existing_image.images[0] }}"
+
 - name: Set image user variable
   set_fact:
-    image_user: "{{ container_image.image.Config.User }}"
-  when: container_image.image.Config.User | length > 0
+    image_user: "{{ container_image.Config.User }}"
+  when:
+    - not ansible_check_mode
+    - container_image.Config.User | length > 0