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/converge.yml

@@ -0,0 +1,7 @@
+---
+- name: Apply overrides
+  ansible.builtin.import_playbook: >-
+    {{ lookup("ansible.builtin.env", "OVERRIDES_FILE") }}
+
+- name: Converge
+  ansible.builtin.import_playbook: ../../site.yml