Use busybox for cleanupProxy image

[p1-repo-sync-bot[bot]]

Feature Request

Why

We should be able to use an existing community image (like busybox) to perform the cleanupProxy actions.

Proposed Solution

Use the alpine container image in values.yaml:

cleanupProxy:
      image:
        registry: registry1.dso.mil
        repository: ironbank/opensource/alpinelinux/alpine
        tag: 3.19.1
        sha: ""
        pullPolicy: IfNotPresent

and update the job-patchWebhook.yaml:

- name: cleanup-proxy
  command:
  - /bin/sh
  - -c
  - |
    until wget --spider -q http://localhost:15021/healthz/ready; do echo \"Waiting for Sidecar...\"; sleep 3; done;
    echo \"Sidecar available, sleeping 10 seconds then killing istio proxy...\";
    sleep 10;
    x=$(echo $?); wget --post-data='' -qO- http://localhost:15020/quitquitquit && exit $x