Refactor from deployment to cronjob

[onmomo]

The project could leverage the K8s CronJob to do the scheduling. This would simplify the code and optimize the K8s resource usage.

eg

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: ecr-credentials-updater
spec:
  schedule: "* */3 * * *" # ecr token expires every 12 hours, we try every 3 hours to refresh the token
  concurrencyPolicy: Forbid
  successfulJobsHistoryLimit: 1
  failedJobsHistoryLimit: 2
...

[trondhindenes]

agreed! I'll see if I can get that done.

[onmomo]

I can try to open a PR later if I find the time. The main issue is to get rid of the kubectl proxy container to allow the job to complete. This requires to refactor the kubectl authentication slightly but not a big deal.

[trondhindenes]

yup, that should be easy enough - its realy not needed. I can do the auth refactoring first, if you want.