build cobald image from slurm role, separated tags

roles/slurm/tasks/dockerimage_build.yml

@@ -1,16 +1,16 @@
 - name: create directories for docker image build
   file:
-    path: "/container/docker-images/slurm-{{image_name}}/{{item}}"
+    path: "/container/docker-images/{{slurm_image_prefix}}-{{image_name}}/{{item}}"
     state: directory
     owner: "{{unpriv_user}}"
     group: docker
   loop: "{{ [''] + (files | map(attribute='dest') | map('dirname') |
                     unique | select | list) }}"
 
-- name: copy Dockerfile
+- name: "copy Dockerfile {{slurm_image_prefix}}:{{image_name}}"
   copy:
-    src: "{{image_name}}.Dockerfile"
-    dest: "/container/docker-images/slurm-{{image_name}}/Dockerfile"
+    content: "{{dockerfile}}"
+    dest: "/container/docker-images/{{slurm_image_prefix}}-{{image_name}}/Dockerfile"
     owner: "{{unpriv_user}}"
     group: docker
   register: slurm_cp_dockerfile
@@ -18,7 +18,7 @@
 - name: copy requisite files
   copy:
     content: "{{ item.content }}"
-    dest: "/container/docker-images/slurm-{{image_name}}/{{item.dest}}"
+    dest: "/container/docker-images/{{slurm_image_prefix}}-{{image_name}}/{{item.dest}}"
     owner: root
     group: root
     mode: u=rwx,g=rx,o=rx
@@ -27,13 +27,14 @@
     label: "{{ item.dest }}"
   register: slurm_cp_files
 
-- docker_image:
-    name: "slurm"
+- name: "build docker image {{slurm_image_prefix}}:{{image_name}}"
+  docker_image:
+    name: "{{slurm_image_prefix}}"
     tag: "{{image_name}}"
 #    pull: False
     build:
       pull: False
-      path: "/container/docker-images/slurm-{{image_name}}/"
+      path: "/container/docker-images/{{slurm_image_prefix}}-{{image_name}}/"
     source: build
     force_source: "{{slurm_cp_dockerfile.changed or
                      slurm_cp_files.changed or