feat: Add support for Helm namespaceOverride

[jgmartinez]

What this PR does / why we need it:

This PR introduces support for overriding Helm namespace in multi-chart deployments (via Dependencies). With the new value namespaceOverride users can now define arbitrary namespaces, independent from the main release namespace.

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• CHANGELOG.md updated
  • If the change is worth mentioning in the release notes, add add-to-release-notes label
• For Helm chart changes bump the Helm chart version in production/helm/loki/Chart.yaml and update production/helm/loki/CHANGELOG.md and production/helm/loki/README.md. Example PR

[CLAassistant]

All committers have signed the CLA.

[JStickler]

Did you edit this file directly? Or was this change automatically generated? The Helm reference should be updated in production/helm/loki/reference.md.gotmlp. There's a note to that effect at line 11 of the docs/sources/setup/install/helm/reference.md file, you might have missed it.

[jgmartinez]

Yes, I missed it. Thanks for the heads up :)

[slim-bean]

I've been working a lot more with Helm lately but am still learning...

Can you help explain a bit more how this gets used? or why this is needed?

Is this a pattern that a lot of charts follow?

Also as an FYI I've got a branch with a lot of changes we are making to add the distributed version of the chart, this comes with a lot of changes so I think we'll likely have to wait until that is merged before we can merge this (so probably not until later next week) Sorry for the inconvenience here

[npapapietro]

I've been working a lot more with Helm lately but am still learning...

Can you help explain a bit more how this gets used? or why this is needed?

Is this a pattern that a lot of charts follow?

Also as an FYI I've got a branch with a lot of changes we are making to add the distributed version of the chart, this comes with a lot of changes so I think we'll likely have to wait until that is merged before we can merge this (so probably not until later next week) Sorry for the inconvenience here

As someone looking forward to this change, one reasons (other than the rest of the grafana charts offer this option, loki's chart seems to break the pattern):

Bundling as a dependency; helm doesn't let you select dependency namespaces independently without it. A common use case for me is having a bootstrapping or baseline set of apps in a single helmchart that will go up in different namespaces of a cluster without needing any tools other than helm

[jgmartinez]

Hi and sorry for the delay. I'll need to look further into this PR, because chart dependencies also need to support namespace override, and some of them currently don't.

After testing it in our environment there are some things still breaking 😞