Add app-github configuration to policy.hujson for Kubernetes integration

This commit introduces a new application configuration for 'app-github' in the policy.hujson file, specifying its connectors and presetAppID. This addition enhances the policy definitions for better integration with Kubernetes.

Author: rajsinghtech

tailscale/policy.hujson

@@ -184,6 +184,11 @@
 					// 	"connectors":  ["tag:k8s"],
 					// 	"presetAppID": "aws-cloudfront-global",
 					// },
+					{
+						"name":        "app-github",
+						"connectors":  ["tag:k8s"],
+						"presetAppID": "github",
+					},
 					{
 						"name":       "shared",
 						"connectors": ["tag:k8s"],