Add multi-mode HTML, Docker, Helm chart, and deploy script

- Add shop-mode.html and project-mode.html for separate calculation
modes - Refactor index.html as a landing page for mode selection - Add
Dockerfile with optimized nginx config and healthcheck - Add
.dockerignore for cleaner Docker builds - Add deploy.sh for
Helm/Kubernetes deployment automation - Add helm-chart/ with
values.yaml, Chart.yaml, templates, and documentation - Update README.md
with full instructions, features, and CI/CD examples

helm-chart/values.yaml

@@ -0,0 +1,187 @@
+# Default values for calcolatore-prezzi-software
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+
+# Use base-helm common chart for standard configurations
+common:
+  # Name override
+  nameOverride: ""
+  fullnameOverride: "calcolatore-prezzi"
+
+# Application configuration
+replicaCount: 2
+
+image:
+  repository: nginx
+  pullPolicy: IfNotPresent
+  tag: "alpine"
+
+imagePullSecrets: []
+
+serviceAccount:
+  create: true
+  annotations: {}
+  name: ""
+
+podAnnotations: {}
+
+podSecurityContext:
+  fsGroup: 2000
+  runAsNonRoot: true
+  runAsUser: 1000
+
+securityContext:
+  capabilities:
+    drop:
+    - ALL
+  readOnlyRootFilesystem: true
+  allowPrivilegeEscalation: false
+
+service:
+  type: ClusterIP
+  port: 80
+  targetPort: 80
+  annotations: {}
+
+ingress:
+  enabled: true
+  className: "nginx"
+  annotations:
+    cert-manager.io/cluster-issuer: "letsencrypt-prod"
+    nginx.ingress.kubernetes.io/ssl-redirect: "true"
+  hosts:
+    - host: calcolatore.example.com
+      paths:
+        - path: /
+          pathType: Prefix
+  tls:
+    - secretName: calcolatore-tls
+      hosts:
+        - calcolatore.example.com
+
+resources:
+  limits:
+    cpu: 200m
+    memory: 256Mi
+  requests:
+    cpu: 100m
+    memory: 128Mi
+
+autoscaling:
+  enabled: false
+  minReplicas: 2
+  maxReplicas: 5
+  targetCPUUtilizationPercentage: 80
+  targetMemoryUtilizationPercentage: 80
+
+nodeSelector: {}
+
+tolerations: []
+
+affinity:
+  podAntiAffinity:
+    preferredDuringSchedulingIgnoredDuringExecution:
+      - weight: 100
+        podAffinityTerm:
+          labelSelector:
+            matchExpressions:
+              - key: app.kubernetes.io/name
+                operator: In
+                values:
+                  - calcolatore-prezzi
+          topologyKey: kubernetes.io/hostname
+
+# Liveness and Readiness probes
+livenessProbe:
+  httpGet:
+    path: /
+    port: 80
+  initialDelaySeconds: 30
+  periodSeconds: 10
+  timeoutSeconds: 5
+  successThreshold: 1
+  failureThreshold: 3
+
+readinessProbe:
+  httpGet:
+    path: /
+    port: 80
+  initialDelaySeconds: 5
+  periodSeconds: 5
+  timeoutSeconds: 3
+  successThreshold: 1
+  failureThreshold: 3
+
+# Volume mounts for static files
+volumeMounts:
+  - name: html-content
+    mountPath: /usr/share/nginx/html
+    readOnly: true
+  - name: nginx-cache
+    mountPath: /var/cache/nginx
+  - name: nginx-run
+    mountPath: /var/run
+
+volumes:
+  - name: html-content
+    configMap:
+      name: calcolatore-html-content
+  - name: nginx-cache
+    emptyDir: {}
+  - name: nginx-run
+    emptyDir: {}
+
+# ConfigMap for HTML files
+configMaps:
+  html-content:
+    data:
+      # The HTML files will be injected here
+      # In production, you would use a CI/CD pipeline to update these
+      index.html: |
+        <!-- Your index.html content will be here -->
+      shop-mode.html: |
+        <!-- Your shop-mode.html content will be here -->
+
+# Environment variables
+env: []
+  # - name: ENVIRONMENT
+  #   value: "production"
+
+# Additional labels
+labels: {}
+
+# Pod Disruption Budget
+podDisruptionBudget:
+  enabled: true
+  minAvailable: 1
+
+# Network Policy
+networkPolicy:
+  enabled: false
+  policyTypes:
+    - Ingress
+    - Egress
+  ingress:
+    - from:
+      - namespaceSelector:
+          matchLabels:
+            name: ingress-nginx
+      ports:
+        - protocol: TCP
+          port: 80
+  egress:
+    - to:
+      - namespaceSelector: {}
+      ports:
+        - protocol: TCP
+          port: 53
+        - protocol: UDP
+          port: 53
+
+# Monitoring
+monitoring:
+  enabled: false
+  serviceMonitor:
+    enabled: false
+    interval: 30s
+    path: /metrics