Add simple TypeScript program to customize k8s cluster

[beyang]

TODO

• [x] Record video

Later TODO

• [ ] Get minikube working again
• [ ] Add tests (different customize.ts examples that render to different directories)

Features supported

• [x] TLS
• [x] Repository cloning
• [x] Replica count
• [x] Storage class (GCP, AWS, Azure, other)
• [x] NodeSelector (resource-hungry pods to larger nodes)
• [x] Custom Redis
• [x] Custom Postgres
• Overlays
  • [x] Non-root
  • [x] Minikube
  • [ ] Non-privileged
  • [ ] Namespaced
• [ ] Add license key
• [ ] NetworkPolicy and NetworkPolicy with Namespaced Overlay Example