Init NetBox Operator Helm chart

[LeoColomb]

This PR implements a Helm chart for the NetBox Operator.

Resolves netbox-community/netbox-operator#105

Tasks

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1. Templates & Rendering
2. Integration tests
3. READMEs and docs

[LeoColomb]

Thanks for your review, @jstudler!
Indeed, just switched to an empty default so it can use the upstream value.

While I think I'm mostly done with the chart, I struggle to set up a correct CI environment.
Having a NetBox automatically configured with restorationHashFieldName custom field seems difficult to automate.
Do you have an instance available for test somewhere? If not, do you have a way to automate?

[jstudler]

For automated deployment on a local kind cluster you can use make create-kind && make deploy-kind from https://github.com/netbox-community/netbox-operator/blob/main/Makefile

We currently just load a SQL file to the database (see https://github.com/netbox-community/netbox-operator/blob/main/kind/load-data-job/local-demo-data.sql#L3)

[LeoColomb]

Thanks for the input @jstudler.
That's nothing we can easily do in the Helm chart testing CI, I'm afraid…
But all fine, I guess a NetBox Cloud tiny instance would do the trick. 😊

[jstudler]

Just tested this, looks good to me!

[RangerRick]

let's do it