Add Kubernetes Tailscale Operator example with MTU fix

[mo124121]

Summary

• Adds Kubernetes manifest example for deploying Minecraft Bedrock server with Tailscale Operator
• Includes initContainer workaround to fix iOS client connectivity issues through Tailscale VPN
• Addresses MTU negotiation problem discussed in iOS clients cannot connect through Tailscale VPN due to MTU issues - Workaround with initContainer #553

Background

This resolves the iOS client connection issue when using Tailscale VPN with Minecraft Bedrock Server on Kubernetes. The problem was caused by MTU negotiation differences between iOS and other platforms, resulting in packet fragmentation issues.

Solution

• Added kubernetes-tailscale-operator.yml example in the examples/ directory
• Implements initContainer with busybox to set MTU to 1280 bytes
• Includes proper security context with NET_ADMIN capability
• References the original discussion for context

[itzg]

Thanks and thanks again for all the research.