Support obtaining helm chart from ConfigMap.

[iciclespider]

What problem are you facing?

I do not want to rely on an external helm repository or an external server url providing the helm chart.

How could Crossplane help solve your problem?

Allow the helm chart used to be obtained from a ConfigMap.

[briantopping]

This would be really helpful for a POC we are building. We have a vendor that distributes Helm charts, but not publicly. Our internal repositories are not accessible from public clouds. We can't put their chart on a public repository. There is no S3 bucket support (though on second thought S3 should work as a manual copy of the chart tarball and use the URL to grab it over HTTPS).

Putting the chart into something like a CM would help us bridge the feasibility gap so we can petition them with working code to post a public repo.