feat: add worker nodes to docker swarm setup

roles/docker/meta/argument_specs.yml

@@ -0,0 +1,25 @@
+---
+argument_specs:
+  main:
+    short_description: Main entrypoint
+    author:
+      - aleidk
+    options:
+      users:
+        type: "list"
+        elements: "str"
+        default: []
+        description:
+          - "list of users to add to the docker group"
+
+  swarm_workers:
+    short_description: Docker swarm workers setup
+    author:
+      - aleidk
+    options:
+      managers_group:
+        type: "str"
+        required: true
+        description:
+          - "The host group of the managers"
+          - "Used to obtain the advertised address and join tokens"