Add CI/CD workflows for building and deploying Docker images to Kubernetes

.github/workflows/cd.yml

@@ -0,0 +1,94 @@
+# Continuous Deployment Workflow
+# This workflow deploys your application to Kubernetes cluster
+# Trigger: Manual dispatch only
+
+name: CD - Deploy to Kubernetes
+
+# Trigger configuration - manual dispatch only
+on:
+  workflow_dispatch:
+    inputs:
+      image_tag:
+        description: 'Docker image tag to deploy (e.g., latest, v1.0.0)'
+        required: false
+        default: 'latest'
+        type: string
+      namespace:
+        description: 'Kubernetes namespace (e.g., production, staging)'
+        required: false
+        default: 'default'
+        type: string
+      ingress_host:
+        description: 'Ingress host domain (e.g., www.example.com)'
+        required: false
+        default: ''
+        type: string
+
+# Environment variables available to all jobs
+env:
+  # Kubernetes configuration
+  KUBECONFIG_DATA: ${{ secrets.KUBECONFIG_DATA }}
+  KUBERNETES_URL: ${{ secrets.KUBERNETES_URL }}
+  KUBERNETES_NAMESPACE: ${{ inputs.namespace || secrets.KUBERNETES_NAMESPACE }}
+  KUBERNETES_INGRESS_HOST: ${{ inputs.ingress_host || secrets.KUBERNETES_INGRESS_HOST }}
+  
+  # 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: ${{ inputs.image_tag || 'latest' }}
+
+jobs:
+  deploy:
+    name: Deploy to Kubernetes
+    runs-on: ubuntu-latest
+    
+    steps:
+      # Step 1: Checkout code from repository
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      # Step 2: Install kubectl (Kubernetes CLI tool)
+      - name: Install kubectl
+        uses: azure/setup-kubectl@v4
+        with:
+          version: 'latest'
+      
+      # Step 3: Install envsubst (for environment variable substitution)
+      - name: Install envsubst
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gettext-base
+      
+      # Step 4: Make CD script executable
+      - name: Make CD script executable
+        run: chmod +x script/cd.sh
+      
+      # Step 5: Deploy to Kubernetes
+      - name: Deploy to Kubernetes
+        run: ./script/cd.sh deploy
+      
+      # Step 6: Output deployment summary
+      - 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}\`" >> $GITHUB_STEP_SUMMARY
+          echo "**URL:** http://${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
+      
+      # Step 7: Output failure message
+      - 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