feat: implements a better kubernetes deployment setup

.k8s/config.yml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  namespace: ${KUBE_NAMESPACE}
+  name: frontend-config
+data:
+  BACKEND_URL: "${BACKEND_URL}"
+  GITHUB_USER: "${GH_USER}"

.k8s/deployment.yaml

@@ -0,0 +1,59 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  namespace: ${KUBE_NAMESPACE}
+  name: frontend-deployment
+  labels:
+    app: frontend
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: frontend
+  template:
+    metadata:
+      labels:
+        app: frontend
+    spec:
+      nodeSelector:
+        ${WORKER_NODE_LABEL}
+      initContainers:
+        - name: wait-backend-init
+          image: busybox:latest
+          args:
+            - /bin/sh
+            - -c
+            - >
+              set -x;
+              while [ $(curl -sw '%{http_code}' "backend-service:8000/health" -o /dev/null) -ne 200 ]; do
+              sleep 15;
+              done
+      containers:
+        - name: frontend
+          image: ${IMAGE_BASE}:${TAG}
+          imagePullPolicy: "Always"
+          resources:
+            requests:
+              memory: "128Mi"
+              cpu: "75m"
+            limits:
+              memory: "128Mi"
+              cpu: "256m"
+          ports:
+            - containerPort: 5000
+          readinessProbe:
+            httpGet:
+              path: /
+              port: 5000
+            initialDelaySeconds: 10
+          livenessProbe:
+            httpGet:
+              path: /
+              port: 5000
+            initialDelaySeconds: 10
+          envFrom:
+            - configMapRef:
+                name: frontend-config
+          env:
+            - name: PORT
+              value: "5000"

.k8s/ingress.yaml

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+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  namespace: ${KUBE_NAMESPACE}
+  name: nginx-ingress
+  annotations:
+    kubernetes.io/ingress.class: nginx
+    nginx.ingress.kubernetes.io/use-regex: "true"
+    nginx.ingress.kubernetes.io/rewrite-target: /
+spec:
+  tls:
+    - hosts:
+        - ${KUBE_DOMAIN}
+      secretName: letsencrypt-cluster-certificate-tls
+  rules:
+    - host: ${KUBE_DOMAIN}
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: frontend-service
+                port:
+                  number: 5000

.k8s/service.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Service
+metadata:
+  namespace: ${KUBE_NAMESPACE}
+  name: frontend-service
+spec:
+  selector:
+    app: frontend
+  ports:
+    - port: 5000
+      protocol: TCP
+      targetPort: 5000
+  type: ClusterIP