feat: add kubernetes deploy (#1001)

kubernetes/README.md

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+## 增加一个Kubernetes的部署方式
+```
+kubectl apply -f deploy.yaml
+```
+
+### 如果需要Ingress域名接入
+```
+kubectl apply -f ingress.yaml
+```

kubernetes/deploy.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: chatgpt-web
+  labels:
+    app: chatgpt-web
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: chatgpt-web
+  strategy:
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        app: chatgpt-web
+    spec:
+      containers:
+        - image: chenzhaoyu94/chatgpt-web
+          name: chatgpt-web
+          imagePullPolicy: Always
+          ports:
+          - containerPort: 3002
+          env:
+          - name: OPENAI_API_KEY
+            value: sk-xxx
+          - name: OPENAI_API_BASE_URL
+            value: "https://api.openai.com"
+          - name: OPENAI_API_MODEL
+            value: gpt-3.5-turbo
+          - name: API_REVERSE_PROXY
+            value: https://bypass.duti.tech/api/conversation
+          - name: AUTH_SECRET_KEY
+            value: '123456'
+          - name: TIMEOUT_MS
+            value: '60000'
+          - name: SOCKS_PROXY_HOST
+            value: ''
+          - name: SOCKS_PROXY_PORT
+            value: ''
+          - name: HTTPS_PROXY
+            value: ''
+          resources:
+            limits:
+              cpu: 500m
+              memory: 500Mi
+            requests:
+              cpu: 300m
+              memory: 300Mi
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: chatgpt-web
+  name: chatgpt-web
+spec:
+  ports:
+  - name: chatgpt-web
+    port: 3002
+    protocol: TCP
+    targetPort: 3002
+  selector:
+    app: chatgpt-web
+  type: ClusterIP

kubernetes/ingress.yaml

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+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  annotations:
+    kubernetes.io/ingress.class: nginx
+    nginx.ingress.kubernetes.io/proxy-connect-timeout: "5"
+  name: chatgpt-web
+spec:
+  rules:
+  - host: chatgpt.example.com
+    http:
+      paths:
+      - backend:
+          service:
+            name: chatgpt-web
+            port:
+              number: 3002
+        path: /
+        pathType: ImplementationSpecific
+  tls:
+  - secretName: chatgpt-web-tls