Ability to override image repository in test-graceful-shutdown.yaml via values.yaml

[alaturqua]

We are using Image Caching via Azure Container Registry to overcome pull limits on Docker Hub.

It would be nice to be able to override image repository for images used in test yamls as well.

[nineinchnick]

You can set the image repo and registry in values https://trinodb.github.io/charts/charts/trino/#values
The title of this issue is confusing. Why would you need to change the image in tests?

[alaturqua]

It is pulling from bitnami/kubectl:tag.

I would like to set it to customrepo/bitnami/kubectl:tag.

Otherwise we are hitting the pull limits on docker image.

[nineinchnick]

If you're running tests in a fork, can you just change it in the fork?

[nineinchnick]

We talked offline and I realized the tests are shipped with the chart. If users can run them, we should use the same values for adding image repository prefix as for the main Trino image.