fix(manager/kustomize): prevent setting replaceString for OCI chart extraction with registry aliases

[tiagodcc]

Changes

When using the kustomize manager, Helm charts may be referenced using OCI registries. However, if registry aliases are used, replaceString is set by the dockerfile manager, leading to a failure while replacing the version key of the existing context. In this PR, the object key replaceString is deleted using a destruction.

The issue has already been described in the following discussion: #37638

Context

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[tiagodcc]

I had to force push to correct the author information of the commit.

This change only addresses the issue in the kustomize manager. However, I suspect a more central fix might be appropriate in the dockerfile manager, specifically here: https://github.com/renovatebot/renovate/blob/main/lib/modules/manager/dockerfile/extract.ts#L186

It appears the specifyReplaceString parameter is being ignored in that logic. I was hesitant to make the change there as I wasn't completely sure about potential side effects for other managers.

What are your thoughts? If you agree the dockerfile manager is the better approach, I'm happy to update this PR.

[RahulGautamSingh]

I get the issue, but this does not seems to be the correct solution. Can you please create a minimal reproduction so we can discuss the best solution?

[tiagodcc]

Thanks for your fast reply! I created a minimal reproduction here: https://github.com/tiagodcc/kustomize-oci-helm

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🎉 This PR is included in version 42.14.2 🎉

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