Add Helm chart for Helm backend storage

[pkosiec]

Description

Changes proposed in this pull request:

• Add Helm chart for Helm backend storage

Testing

# Install chart (ofc you can use different name of the helm release)
helm install capact ./deploy/kubernetes/charts/helm-storage-backend --set=global.containerRegistry.path="ghcr.io/capactio/pr" --set=global.containerRegistry.overrideTag="PR-669" --wait

# Get logs
k logs capact-helm-storage-backend-{random} release -f
k logs capact-helm-storage-backend-{random} template -f

# Port forward
kubectl port-forward svc/capact-helm-storage-backend-release 3000:50051
# in second terminal:
kubectl port-forward svc/capact-helm-storage-backend-template 3001:50052

Now, you can do some gRPC calls via Insomnia to localhost:3000 and localhost:3001 and observe logs to see that proper backends are called.

Related issue(s)

670