Kubernetes support (#85)

* Added a kubernetes example
* Added an helm chart for kubernetes usage
* Added README for the added examples

examples/kubernetes/README.md

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+# Kubernetes installation of Docker Registry UI
+
+## Full installation
+Install a registry and docker-registry-ui as frontend of this registry to kubernetes.
+
+```sh
+kubectl apply -f *.yaml
+```
+
+Please note that you'll need a PV provisionner to be able to store the uploaded images.
+
+## Dynamic installation
+Edit the image tag in the ui-deployement.yaml file and set it to `latest`, then :
+
+```sh
+kubectl apply -f ui*.yaml
+```
+
+You'll get a docker-registry-ui pod installed inside kubernetes and you'll be able to configure it to act as a frontend to your existing registry(ies).

examples/kubernetes/registry-configmap.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: docker-registry
+  labels:
+    app: registry
+    release: docker-registry-ui
+    app/version: "1.2.1"
+data:
+  config.yml: |-
+    version: 0.1
+    log:
+      fields:
+        service: registry
+    storage:
+      delete:
+        enabled: true
+      cache:
+        blobdescriptor: inmemory
+      filesystem:
+        rootdirectory: /var/lib/registry
+    http:
+      addr: :5000
+      headers:
+        X-Content-Type-Options: [nosniff]
+        Access-Control-Allow-Origin: ['*']
+        Access-Control-Allow-Methods: ['HEAD', 'GET', 'OPTIONS', 'DELETE']
+        Access-Control-Allow-Headers: ['Authorization']
+        Access-Control-Max-Age: [1728000]
+        Access-Control-Allow-Credentials: [true]
+        Access-Control-Expose-Headers: ['Docker-Content-Digest']

examples/kubernetes/registry-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: docker-registry
+  labels:
+    app: registry
+    release: docker-registry-ui
+    app/version: "1.2.1"
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: registry
+      release: docker-registry-ui
+  template:
+    metadata:
+      labels:
+        app: registry
+        release: docker-registry-ui
+    spec:
+      volumes:
+        - name: config
+          configMap:
+            defaultMode: 420
+            name: docker-registry
+        - name: data
+          persistentVolumeClaim:
+            claimName: docker-registry
+      containers:
+        - name: registry
+          image: "docker.io/registry:2.6.2"
+          imagePullPolicy: Always
+          ports:
+            - name: registry
+              containerPort: 5000
+              protocol: TCP
+          volumeMounts:
+            - mountPath: "/var/lib/registry"
+              name: "data"
+            - mountPath: "/etc/docker/registry"
+              name: "config"
+          livenessProbe:
+            httpGet:
+              path: /v2/
+              port: registry
+          readinessProbe:
+            httpGet:
+              path: /v2/
+              port: registry
+          resources:
+            {}

examples/kubernetes/registry-pvc.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  labels:
+    app: registry
+    release: docker-registry-ui
+    app/version: "1.2.1"
+  name: docker-registry
+spec:
+  accessModes:
+    - "ReadWriteOnce"
+  resources:
+    requests:
+      storage: 1Gi

examples/kubernetes/registry-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: docker-registry
+  labels:
+    app: registry
+    release: docker-registry-ui
+    app/version: "1.2.1"
+spec:
+  type: ClusterIP
+  ports:
+    - port: 5000
+      targetPort: registry
+      protocol: TCP
+      name: registry
+  selector:
+      app: registry
+      release: docker-registry-ui

examples/kubernetes/ui-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: docker-registry-ui
+  labels:
+    app: registry-ui
+    release: docker-registry-ui
+    app/version: "1.2.1"
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: registry-ui
+      release: docker-registry-ui
+  template:
+    metadata:
+      labels:
+        app: registry-ui
+        release: docker-registry-ui
+    spec:
+      containers:
+        - name: registry-ui
+          image: "docker.io/joxit/docker-registry-ui:static"
+          imagePullPolicy: Always
+          env:
+            - name: REGISTRY_TITLE
+              value: "Docker registry UI"
+            - name: DELETE_IMAGES
+              value: "false"
+            - name: REGISTRY_URL
+              value: "http://docker-registry.default:5000"
+            - name: PULL_URL
+              value: "docker-registry-ui.default:80"
+          ports:
+            - name: http
+              containerPort: 80
+              protocol: TCP
+          livenessProbe:
+            httpGet:
+              path: /
+              port: http
+          readinessProbe:
+            httpGet:
+              path: /
+              port: http
+          resources:
+            {}
+

examples/kubernetes/ui-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: docker-registry-ui
+  labels:
+    app: registry-ui
+    release: docker-registry-ui
+    app/version: "1.2.1"
+spec:
+  type: LoadBalancer
+  ports:
+    - port: 80
+      targetPort: http
+      protocol: TCP
+      name: http
+  selector:
+      app: registry-ui
+      release: docker-registry-ui
+