Add external database integration test

Signed-off-by: Derek Nola <derek.nola@suse.com>

tests/external.yml

@@ -0,0 +1,18 @@
+---
+k3s_cluster:
+  children:
+    server:
+      hosts:
+        server-node:
+  vars:
+    ansible_connection: docker
+    ansible_user: root
+    ansible_become: true
+    k3s_version: v1.33.4+k3s1
+    token: "secret12345"
+    api_endpoint: "server-node"
+    extra_server_args: "--snapshotter=native"
+    extra_agent_args: "--snapshotter=native"
+    use_external_database: true
+    server_config_yaml: |
+      datastore-endpoint: mysql://root:e2e@tcp(mysqlDB:3306)/k3s