[installer] updating the refCache image in image-builder-mk3

[nandajavarma]

Description

This PR updates the workspace image name in the refCache of image-builder-mk3-config configmap when a custom workspace base image is provided in the installer config file. This means the correct base images are not cached, slightly slowing the image build.

Related Issue(s)

Fixes #11684

How to test

Create a Gitpod self hosted instance by opening a Gitpod workspace from main, making sure you have access to core-dev cluster and running: (you can read more about this preview setup here)

werft run github -j .werft/self-hosted-installer-tests.yaml -a skipTests=true -a preview=true -a deps=external

When the job is finished, you will get the URL and KUBECONFIG details under the get-results phase tab of the werft job.

Connect to KOTS UI by running kubectl kots admin-console -n gitpod, go to the config tab, tick the Enable advanced options and upload config patch with the following content:

workspace:
  workspaceImage: "gcr.io/sh-automated-tests/busybox:latest"
containerRegistry:
  privateBaseImageAllowList:
    - "gcr.io"

Redeploy as prompted. Once the setup is ready, check the refCache field in the configmap image-builder-mk3-config under gitpod namespace. You will see that it still shows workspace-full image.

Now update to the changes corresponding to this branch by doing the following(I have updated the changes to the dev-nan channel):

• Go to replicated.com -> Customers -> dev-nan -> Download all licenses
• In the KOTS UI, update the license to the downloaded file and redeploy.
• You will now see the correct image in the refCache field

Release Notes

NONE

Documentation

Werft options:

• /werft with-preview