test: less fragile integration suite [ci skip]

See coop-cloud/organising#584
See coop-cloud/organising#595

tests/integration/helpers/docker.bash

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+_ensure_swarm() {
+  if [ "$(docker info | grep Swarm | sed 's/Swarm: //g' | tr -d ' ')" == "inactive" ]; then
+    run docker swarm init
+    assert_success
+  fi
+
+  if ! $(docker network ls | grep -q 'proxy'); then
+    run docker network create -d overlay proxy
+    assert_success
+  fi
+}