CI job that deploys Weaviate on K8s cluster

[samos123]

Seems currently the PR CI job does only basic helm tests but not an actual integration test. It would be better to use e.g. a small kind cluster in the CI job and deploy the actual helm chart and verify that weaviate works as intended.

See following resources: https://github.com/helm/kind-action

https://github.com/helm/chart-testing-action