Test playbook using molecule (#67)

* Test cluster using molecule

* Fix detection of first control node

* Include --flannel-iface and --node-ip as k3s arguments

* Store logs of k3s-init.service as GitHub job artifacts

molecule/resources/verify/from_outside/tasks/kubecfg-cleanup.yml

@@ -0,0 +1,5 @@
+---
+- name: Clean up kubecfg
+  ansible.builtin.file:
+    path: "{{ kubecfg.path }}"
+    state: absent