image release versions for ExtraInitContainers (i.e. custom themes) through Values/variables about helm-charts

[unguiculus]

This is already possible. The tpl function is used to process the value for extraInitContainers. That's the reason why it has to be a string. You can use templating exactly as you described above. Just set the values you specified, either in a values file or via CLI: --set themes-version=42

[rvanderboom]

mmm strange because everywhere i read its not supported to have values into values files itself, it also gives error about not understanding value within values files.
we have to invest further then

[unguiculus]

By defauolt, it's indeed not supported. However, the tpl function does the trick. Look at this example in the readme:
https://github.com/codecentric/helm-charts/tree/master/charts/keycloak#using-google-cloud-sql-proxy

[unguiculus]

Closing this. Feel free to reopen if this is still an issue for you.