Adding a Helm chart to run the service in Kubernetes

[handyman5]

This PR adds support for running MediaTracker in Kubernetes via a Helm chart, created with helm create.

Additions to the standard template:

• Set the image repository
• Removed serviceAccount, since it's not used
• Set service port to 7481
• Added persistent volumes for assets and data volumes
• Added support for specifying environment variables, as described in the README

[bonukai]

@handyman5 Could you point me in direction on how can I test it? I have never used Kubernetes