Add retries for container import; Add cluster API images

ansible/roles/firstboot/files/ansible_payload/roles/metacluster/tasks/assets.yml

@@ -2,6 +2,11 @@
   ansible.builtin.command:
     cmd: k3s ctr image import {{ item }} --digests
     chdir: /opt/metacluster/container-images
+  register: import_result
   loop: "{{ query('ansible.builtin.fileglob', '/opt/metacluster/container-images/*.tar') | sort }}"
   loop_control:
     label: "{{ item | basename }}"
+  # Probably should add a task before that ensures K3s node is fully initialized before starting imports; currently K3s goes away briefly during this loop
+  retries: 3
+  delay: 10
+  until: import_result is not failed