feat: add worker nodes to docker swarm setup

roles/docker/tasks/swarm_worker.yaml

@@ -0,0 +1,9 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/ansible/ansible-lint/refs/heads/main/src/ansiblelint/schemas/tasks.json
+---
+- name: Join Docker Swarm as a worker
+  vars:
+    key: "{{ groups[managers_group] | map('extract', hostvars, ['swarm_info', 'swarm_facts', 'JoinTokens', 'Worker']) | list | first }}"
+  community.docker.docker_swarm:
+    state: join
+    join_token: "{{ key }}"
+    remote_addrs: "{{  groups[managers_group] | map('extract', hostvars, ['ansible_default_ipv4', 'address']) }}"