🚀 Complete automation pipeline with SSL, testing, and deployment

✨ Features:
- Full SSL setup with Let's Encrypt for all environments
- Automated CI/CD pipeline with GitHub Actions
- Comprehensive smoke testing workflow
- Auto-deploy to dev on main branch push
- Manual staging/production deployments with confirmation
- Istio + nginx SSL termination architecture

🔧 Infrastructure:
- Migrated from Kourier to Istio for Knative ingress
- nginx handles SSL termination and public traffic
- Istio manages internal Knative service routing
- Scale-to-zero configuration for all environments

🧪 Testing:
- SSL certificate validation and expiry checks
- Domain accessibility and content validation
- Performance testing and redirect behavior validation
- Automated smoke tests on every deployment

🌐 Domains:
- Dev: https://2048-dev.wa.darknex.us
- Staging: https://2048-staging.wa.darknex.us
- Production: https://2048.wa.darknex.us

📦 Deployment:
- Uses latest GHCR images with imagePullPolicy: Always
- Automated secret management across namespaces
- Environment-specific Knative service configurations
- Clean manifest structure with proper labeling

manifests/knative-domain-config.yaml

@@ -4,5 +4,13 @@ metadata:
   name: config-domain
   namespace: knative-serving
 data:
-  wa.darknex.us: ""
+  dev.wa.darknex.us: |
+    selector:
+      environment: development
+  staging.wa.darknex.us: |
+    selector:
+      environment: staging
+  wa.darknex.us: |
+    selector:
+      environment: production
   autocreate-cluster-domain-claims: "true"