[MANIFEST] Set up a workflow to test clearing cache on the notify website post a deploy

[jzbahrai]

What happens when your PR merges?

Set up a workflow to clear the cache after the kube deployment is complete.
I haven't added the workflow for production yet- but once this is merged and tested on staging, I will.

Checklist if releasing new version:

• I made sure that the changes are as expected in Notify staging
• I have checked if the docker images I am referencing exist
  • api lambda (requires Notification-Production / AdministratorAccess login)
  • api k8s
  • admin
  • documentation
  • document download API

Checklist if making changes to Kubernetes:

• I know how to get kubectl credentials in case it catches on fire

After merging this PR

• I have verified that the tests / deployment actions succeeded
• I have verified that any affected pods were restarted successfully
• I have verified that I can still log into Notify production
• I have verified that the smoke tests still pass on production
• I have communicated the release in the #notify Slack channel.

[github-actions]

ingress	nginx    	2       	2024-02-12 19:08:42.93215444 +0000 UTC	deployed	nginx-ingress-1.1.2	3.4.2      

xray-daemon	xray     	1       	2024-07-29 19:45:48.684608347 +0000 UTC	deployed	aws-xray-4.0.8	3.3.12     

Comparing release=karpenter-crd, chart=/tmp/helmfile929134908/karpenter/staging/karpenter-crd/karpenter-crd/0.36.1/karpenter-crd
Comparing release=karpenter, chart=/tmp/helmfile929134908/karpenter/staging/karpenter/karpenter/0.36.1/karpenter
Comparing release=karpenter-nodepool, chart=charts/karpenter-nodepool
Comparing release=priority-classes, chart=deliveryhero/priority-class
Comparing release=secrets-store-csi-driver, chart=secrets-store-csi-driver/secrets-store-csi-driver
Comparing release=aws-secrets-provider, chart=aws-secrets-manager/secrets-store-csi-driver-provider-aws
Comparing release=kube-state-metrics, chart=prometheus-community/kube-state-metrics
Comparing release=blazer, chart=stakater/application
Comparing release=ingress, chart=charts/nginx-ingress
Comparing release=xray-daemon, chart=okgolove/aws-xray

[whabanks]

LGTM!