fix: wait for cloud-init before package install during bootstrap

Fresh Ubuntu cloud-init clones still hold apt and dpkg locks during first boot,
which caused the Ansible common role to fail before the control plane could
finish bootstrap. Wait for cloud-init, increase apt lock timeouts, and skip the
final kubeconfig rewrite when no kubeconfig was fetched yet.

ansible/site.yml

@@ -148,10 +148,16 @@
   hosts: localhost
   connection: local
   tasks:
+    - name: Check whether kubeconfig was fetched
+      stat:
+        path: ../outputs/kubeconfig
+      register: kubeconfig_file
+
     - name: Update kubeconfig server address
       command: |
         sed -i 's/127.0.0.1/{{ hostvars[groups["control_plane"][0]]["ansible_host"] }}/g' ../outputs/kubeconfig
       changed_when: true
+      when: kubeconfig_file.stat.exists
 
     - name: Display success message
       debug: