docker: Tag complete docker playbook as docker

If we only tag the geerlingguy docker 'role' as docker we do not always
install the necessary python dependencies for later working with ansible
docker compose and network roles.

Applying the docker tag to them we can target '--tags=docker' on
playbook run and be sure that all later roles will have the correct
dependencies.

site.yaml

@@ -16,11 +16,11 @@
   # ansible-galaxy install geerlingguy.docker
 - name: Install docker
   hosts: instance_system
+  tags: docker
   tasks:
     - name: Install docker and docker compose
       ansible.builtin.import_role:
         name: geerlingguy.docker
-      tags: docker
 
     - name: Install docker python requirements
       ansible.builtin.package: