Feat: add helm chart

[dandax123]

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Documentation update
• Refactoring (no functional changes)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• My code follows the style guidelines of this project
• [x ] I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• [x ] I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective
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[remyoudemans]

Thanks for the PR @dandax123!
This seems helpful, but quite out of scope for this project.
We wouldn't want this repository to get filled up with code that isn't needed to run it, because that would come with its own maintenance overhead.

I still think this is valuable work though. If you put all the helm files in a public gist, then we could just link to them in this project's README and keep this repo lean.

[dandax123]

@remyoudemans I think you could create a repo in this same xavia-io organization called xavia-ota-helm and then we can move this there, and add a link in the docs to reference the repo.