Update version & add manage_docker option

templates/docker-compose.j2

@@ -2,7 +2,7 @@ version: '3.6'
 services:
   web:
     image: 'gitlab/gitlab-ee:{{ image_tag }}'
-    restart: always
+    restart: unless-stopped
     hostname: '{{ hostname }}'
     environment:
       GITLAB_OMNIBUS_CONFIG: |
@@ -31,6 +31,7 @@ services:
       - '$GITLAB_HOME/data:/var/opt/gitlab'
     shm_size: '256m'
   runner:
+    # does not have an upgrade path, see https://forum.gitlab.com/t/upgrade-path-for-runner/72130
     image: 'gitlab/gitlab-runner:{{ runner_image_tag }}'
     restart: unless-stopped
     environment: