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

.ansible-lint

@@ -1,3 +1,16 @@
 ---
+exclude_paths:
+  # default paths
+  - '.cache/'
+  - '.github/'
+  - 'test/fixtures/formatting-before/'
+  - 'test/fixtures/formatting-prettier/'
+
+  # The "converge" and "reset" playbooks use import_playbook in
+  # conjunction with the "env" lookup plugin, which lets the
+  # syntax check of ansible-lint fail.
+  - '**/converge.yml'
+  - '**/reset.yml'
+
 skip_list:
   - 'fqcn-builtins'