[SHI-448] Option for code executor image tags that don't match backend

[justinyang-retool]

Customer making a Helm Chart update had with the one-off image they were using tryretool/code-executor-one-offs:pr-3.334.6-fcf7211. The image name does not match the backend image which did not include the pr-. By design in the helm chart, we don't allow for differing image names between backend and code executor. There should be an option for the customer here to be able to override the image for codeExecutor in this case, or we need to make sure the names match.

Note I've decided for now that pullpolicy will not be overrideable

Testing:
In-code testing:

• Put through code a template file:
  Testing with no override:

Testing with override:

Deploy testing:
Before case:

has the default image and the image pulled successfully
Also note the code executor has no image tag while the backend image tag is the one pulled:

After case:

Has the new image for code executor
Note that the code executor pulled successfully
THe pod justinyang-test-547579fb56-nws4p is erroring out but this actually precedes the image override update, and it uses the default image so it's not affected
Also note the helm chart:

[greptile-apps]

Confidence Score: 4/5

The pull-policy regression should be fixed before merging because existing global image-policy configurations will silently stop applying to code executor.

The new template gives precedence to codeExecutor.image.pullPolicy while the chart always defaults that field to IfNotPresent, making the documented global fallback ineffective; the added fixture also does not assert the rendered override values.

Files Needing Attention: charts/retool/values.yaml, charts/retool/templates/deployment_code_executor.yaml, charts/retool/ci/test-code-executor-image-tag-option.yaml

Important Files Changed

Filename	Overview
charts/retool/templates/_helpers.tpl	Adds a direct code-executor tag override while preserving the existing backend-tag derivation as fallback.
charts/retool/templates/deployment_code_executor.yaml	Uses the workload pull policy first, but the accompanying nonempty default prevents existing global pull-policy configurations from being inherited.
charts/retool/values.yaml	Documents and exposes the tag override; the IfNotPresent pull-policy default unintentionally shadows the global setting.
charts/retool/ci/test-code-executor-image-tag-option.yaml	Supplies representative overrides, but CI only checks that the resulting manifests are schema-valid rather than asserting those values.
charts/retool/Chart.yaml	Bumps the chart minor version for the new image-override capability.
values.yaml	Mirrors the chart defaults, including the pull-policy default that prevents global inheritance.

_{Reviews (1): Last reviewed commit: "updated helm chart logic to override the..." | Re-trigger Greptile}