Add docker-swarm setup

roles/docker-swarm/tasks/main.yml

@@ -0,0 +1,17 @@
+---
+# Bring up a docker swarm
+# needs community docker module installed:
+# run $`ansible-galaxy collection install community.docker`
+
+- name: Ensure swarm is initialized
+  community.docker.docker_swarm:
+    state: present
+    # advertise_addr: eth1 # necessary for testing setup on vagrant
+  become: true
+
+- name: Ensure public network exists
+  community.docker.docker_network:
+    name: public
+    driver: overlay
+    state: present
+  become: true