Add CI/CD workflows and Kubernetes configurations for deployment

.github/workflows/cd.yml

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+# Continuous Deployment Workflow
+# This workflow deploys your application to Kubernetes cluster
+# Trigger: After successful CI build or manual dispatch
+
+name: CD - Deploy to Kubernetes
+
+on:
+  workflow_run:
+    workflows: ["CI - Build and Push"]
+    types:
+      - completed
+    branches:
+      - master
+  workflow_dispatch:
+
+env:
+  # Kubernetes configuration
+  KUBECONFIG_DATA: ${{ secrets.KUBECONFIG_DATA }}
+  KUBERNETES_URL: ${{ secrets.KUBERNETES_URL }}
+  KUBERNETES_NAMESPACE: ${{ secrets.KUBERNETES_NAMESPACE }}
+  KUBERNETES_INGRESS_HOST: ${{ secrets.KUBERNETES_INGRESS_HOST }}
+  KUBERNETES_DEPLOYMENT_REPLICAS: ${{ secrets.KUBERNETES_DEPLOYMENT_REPLICAS }}
+  
+  # Container registry configuration
+  CONTAINER_REGISTRY_URL: ${{ secrets.CONTAINER_REGISTRY_URL }}
+  CONTAINER_REGISTRY_USERNAME: ${{ secrets.CONTAINER_REGISTRY_USERNAME }}
+  CONTAINER_REGISTRY_NAMESPACE: ${{ secrets.CONTAINER_REGISTRY_NAMESPACE }}
+  CONTAINER_REGISTRY_PASSWORD: ${{ secrets.CONTAINER_REGISTRY_PASSWORD }}
+  CONTAINER_IMAGE_NAME: ${{ secrets.CONTAINER_IMAGE_NAME }}
+  CONTAINER_IMAGE_TAG: ${{ secrets.CONTAINER_IMAGE_TAG }}
+  FORCE_RESTART: ${{ secrets.KUBERNETES_FORCE_RESTART }}
+  
+  # Application configuration
+  DATABASE_DSN: ${{ secrets.DATABASE_DSN }}
+
+jobs:
+  deploy:
+    name: Deploy to Kubernetes
+    runs-on: ubuntu-latest
+    # Only run if CI workflow succeeded or manually dispatched
+    if: ${{ github.event.workflow_run.conclusion == 'success' || github.event_name == 'workflow_dispatch' }}
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      - name: Make CD script executable
+        run: chmod +x script/cd.sh
+      
+      - name: Deploy to Kubernetes
+        run: ./script/cd.sh deploy
+      
+      - name: Deployment Summary
+        if: success()
+        run: |
+          echo "### :white_check_mark: Deployment Successful!" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "**Application:** \`${CONTAINER_IMAGE_NAME}\`" >> $GITHUB_STEP_SUMMARY
+          echo "**Namespace:** \`${KUBERNETES_NAMESPACE}\`" >> $GITHUB_STEP_SUMMARY
+          echo "**Image:** \`${CONTAINER_REGISTRY_URL}/${CONTAINER_REGISTRY_NAMESPACE}/${CONTAINER_IMAGE_NAME}:${CONTAINER_IMAGE_TAG}\`" >> $GITHUB_STEP_SUMMARY
+          echo "**Database:** Connected" >> $GITHUB_STEP_SUMMARY
+          echo "**URL:** http://${KUBERNETES_INGRESS_HOST}" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "---" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "**Deployment Time:** $(date -u +'%Y-%m-%d %H:%M:%S UTC')" >> $GITHUB_STEP_SUMMARY
+      
+      - name: Deployment Failed
+        if: failure()
+        run: |
+          echo "### :x: Deployment Failed!" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "Please check the logs above for error details." >> $GITHUB_STEP_SUMMARY