Add Kubernetes Deployment manifest files

deployment/README.md

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+# Installation
+
+A basic installation can be invoked with `kubectl apply -f ./kubernetes.yaml`
+
+```yaml
+$ kubectl apply -f ./kubernetes.yaml
+deployment.apps/rustpad-deployment created
+service/rustpad-service created
+```
+
+We can the verify it is running
+```
+$ kubectl get svc rustpad-service
+NAME              TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE
+rustpad-service   ClusterIP   10.43.83.244   <none>        80/TCP    17s
+$ kubectl get pods -l app=rustpad
+NAME                                 READY   STATUS    RESTARTS   AGE
+rustpad-deployment-8799874d6-g2jxb   1/1     Running   0          26s
+```
+
+Then use port-forward to access
+```
+$ kubectl port-forward svc/rustpad-service 8888:80
+Forwarding from 127.0.0.1:8888 -> 3030
+Forwarding from [::1]:8888 -> 3030
+Handling connection for 8888
+```
+
+## Ingress
+
+Ingress depends much on your cluster-issuer and DNS names
+
+In the example `ingress.yaml` my ClusterIssuer is 'myclusterissuer', my ingress provider is 'nginx' and my DNS name is 'rustpad.example.com'
+
+Replace with your own to create a proper TLS ingress for Rustpad, then apply
+
+```
+$ kubectl apply -f ./ingress.yaml
+ingress.networking.k8s.io/rustpadgcpingress created
+```
+
+Note: if you use a different Ingress provider than Nginx, ensure it can support websocket forwarding if you want it to "connect" to the backend server.

deployment/ingress.yaml

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+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  annotations:
+    cert-manager.io/cluster-issuer: myclusterissuer
+    ingress.kubernetes.io/proxy-body-size: "0"
+    ingress.kubernetes.io/ssl-redirect: "true"
+    kubernetes.io/ingress.class: nginx
+    kubernetes.io/tls-acme: "true"
+    nginx.ingress.kubernetes.io/proxy-body-size: "0"
+    nginx.ingress.kubernetes.io/proxy-read-timeout: "3600"
+    nginx.ingress.kubernetes.io/proxy-send-timeout: "3600"
+    nginx.ingress.kubernetes.io/ssl-redirect: "true"
+    nginx.org/client-max-body-size: "0"
+    nginx.org/proxy-connect-timeout: "3600"
+    nginx.org/proxy-read-timeout: "3600"
+    nginx.org/websocket-services: rustpad-service
+  name: rustpadgcpingress
+spec:
+  rules:
+  - host: rustpad.example.com
+    http:
+      paths:
+      - backend:
+          service:
+            name: rustpad-service
+            port:
+              number: 80
+        path: /
+        pathType: ImplementationSpecific
+  tls:
+  - hosts:
+    - rustpad.example.com
+    secretName: rustpadgcp-tls

deployment/kubernetes.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: rustpad-deployment
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: rustpad
+  template:
+    metadata:
+      labels:
+        app: rustpad
+    spec:
+      containers:
+      - name: rustpad-container
+        image: ekzhang/rustpad
+        ports:
+        - containerPort: 3030
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: rustpad-service
+spec:
+  selector:
+    app: rustpad
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 3030
+