fix: building base image -> update child images

roles/slurm/tasks/dockerimage.yml

@@ -18,13 +18,12 @@
         {% for a in slurm_user_accounts | default([]) -%}
         {{a['name']}} {{a['dir']}}{{loop.last | ternary('',',')}}
         {%- endfor %}
-  register: slurm_baseimg_build
   when: not slurm_baseimg_build_chg | default(False)
 
 - set_fact:
     slurm_baseimg_build_chg:
       "{{(slurm_baseimg_build_chg | default(False)) or
-         slurm_baseimg_build.changed}}"
+         slurm_img_build.changed}}"
 
 - name: "build slurm base docker image {{image_name}}"
   include_tasks: dockerimage_build.yml