Use tplvalues.render for templating inside values

[vogre]

What was changed

Use templating for web.service annotations in the same way as server.service is defined https://github.com/temporalio/helm-charts/blob/bad8c74311717f2121579f64e2e6b1670fc19818/charts/temporal/templates/server-service.yaml#L15.

Why?

A very cool trick to allow passing templated values inside the values.yaml file instead of relying on an outside templating engine

Checklist

1. Closes

2. How was this tested: Added a template in values.yaml and ran helm template.

3. Any docs updates needed? No

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[robholland]

I know we already do this, and I'm happy to merge, but could you please explain what the use case is here so I can learn?

[vogre]

@robholland - we use it roughly like this:

e.g. by helm template --set foo=bar -f values_web.yaml, and values_web.yaml of

web:
  service:
    annotations:
      url: https://{{ $.Values.foo }}-temporal.example.com

We would utilize the templating features of helm, inside the values.yaml file (usually the templating only works in the templates/ directory.

Since this behavior is actually surprising - we could also set the value directly by

helm template --set 'web.service.annotations.url=https://bar-temporal.example.com'

Although it's a nice feature to allow extensibility of the template.