some cosmetic changes

roles/docker/handlers/main.yml

@@ -1,18 +1,17 @@
 ---
-# TODO this is yet unused
 - name: test docker setup
   become: true
   community.docker.docker_container:
-    name: test-docker
-    image: hello-world
     state: started
+    name: hello-world
+    image: hello-world
   register: docker_test
   when: docker_install is changed
 
 - name: remove test container
   become: true
   community.docker.docker_container:
-    name: test-docker
-    image: hello-world
     state: absent
-  when: docker_install is changed
+    name: hello-world
+    image: hello-world
+  when: docker_test is changed