template values for library chart

[pmeier]

Issue

TL;DR

• NebariApp spec values like hostname or service configuration often need dynamically computed default values
• Computation can only happens as part of templates
• There is no good native way in helm to blend static and dynamic default values to pass them on as arguments to a template

What does this implement/fix?

TL;DR

• reusable deepTplJson template that recursively applies the tpl function to all strings in a nested structure
• usage of deepTplJson for the metadata and spec of the nebariApp template to allow dynamically computed default values natively

---

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

[pmeier]

Move the checks after the templating as a template might expand into an empty value, while the template itself is not empty.

[pmeier]

Since the only dependency we have is local, we can skip the refresh of all registered repositories the user has, as they don't apply anyway.