fix: clean up Ansible bootstrap warnings

ansible/roles/bootstrap-image-prepull/tasks/main.yml

@@ -1,15 +1,19 @@
 ---
 - name: Pre-pull bootstrap images into containerd
-  command: /usr/local/bin/ctr -n k8s.io images pull {{ item }}
+  command: timeout 180s /usr/local/bin/ctr -n k8s.io images pull {{ item }}
   register: bootstrap_image_pull
   loop: "{{ bootstrap_prepull_images }}"
+  retries: 6
+  delay: 20
+  until: bootstrap_image_pull.rc == 0
   changed_when: bootstrap_image_pull.rc == 0
   failed_when: false
 
-- name: Report bootstrap images that did not pre-pull
+- name: Report bootstrap images that did not pre-pull after retries
   debug:
     msg: >-
-      Bootstrap image pre-pull failed for {{ item.item }}: {{ item.stderr | default('no stderr') }}
+      Best-effort bootstrap image pre-pull did not complete for {{ item.item }} after
+      {{ item.attempts | default(1) }} attempt(s): {{ item.stderr | default('no stderr') }}
   loop: "{{ bootstrap_image_pull.results | default([]) }}"
   loop_control:
     label: "{{ item.item }}"