🔧 Move docker_setup role application to group playbook

To install docker on a host you have to put it into that group in
inventory now, instead of adding the role to each host playbook.  Idea
is to extend the group docker_host playbook by more docker related
things as for example metrics and monitoring.

group-docker_host.yml

@@ -0,0 +1,6 @@
+---
+- hosts: docker_host
+  become: true
+
+  roles:
+    - role: docker_setup

group_vars/docker_host/vars.yml

@@ -0,0 +1,2 @@
+---
+docker_data_root: "/srv/docker"

host-krypton.yml

@@ -20,9 +20,7 @@
 
 
   roles:
-    - role: docker_setup
-      vars:
-        docker_data_root: "/srv/docker"
+    # role 'docker_setup' applied through group 'docker_host'
     - role: apache
     - role: apache_letsencrypt  # Uses configuration from dehydrated setup
     - role: ansible-role-dehydrated

host-pottwal.yml

@@ -3,9 +3,7 @@
   become: true
 
   roles:
-    - role: docker_setup
-      vars:
-        docker_data_root: "/srv/docker"
+    # role 'docker_setup' applied through group 'docker_host'
     - role: apache
     - role: apache_letsencrypt  # Uses configuration from dehydrated setup
     - role: ansible-role-dehydrated

host-radon.yml

@@ -22,9 +22,7 @@
     brotherql_web_image: "pklaus/brother_ql_web:alpine_9e20b6d"
 
   roles:
-    - role: docker_setup
-      vars:
-        docker_data_root: "/srv/docker"
+    # role 'docker_setup' applied through group 'docker_host'
     - role: apache
     - role: apache_letsencrypt  # Uses configuration from dehydrated setup
     - role: ansible-role-dehydrated

host-tau.yml

@@ -17,7 +17,7 @@
     dokuwiki_image: "bitnami/dokuwiki:20220731@sha256:989ab52cf2d2e0f84166e114ca4ce88f59546b8f6d34958905f8d81c18cbd759"
 
   roles:
-    - role: docker_setup
+    # role 'docker_setup' applied through group 'docker_host'
     - role: apache
     - role: penguineer.dehydrated_cron
 

host-unicorn.yml

@@ -5,10 +5,10 @@
   vars:
     ansible_python_interpreter: /usr/bin/python3
     data_dir: "/srv/data"
+
   roles:
-    - role: docker_setup
-      vars:
-        docker_data_root: "/srv/docker"
+    # role 'docker_setup' applied through group 'docker_host'
+
   tasks:
     - name: Setup the docker container for unifi-controller
       docker_container:

host_vars/tau.netz39.de/vars.yml

@@ -1,3 +1,4 @@
 ---
 server_admin: "admin+tau@netz39.de"
 mysql_root_pw: "{{ vault_mysql_root_pw }}"
+docker_data_root: "/var/lib/docker"

main.yml

@@ -7,6 +7,9 @@
 - name: Specific setup for all proxmox hosts
   import_playbook: group-proxmox.yml
 
+- name: Specific setup for all docker host hosts
+  import_playbook: group-docker_host.yml
+
 - name: Tau specific setup
   import_playbook: host-tau.yml