Added new multi-stage Azure DevOps pipeline (#6)

Adding new pipeline

azure-pipelines.yml

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+variables:
+  
+  - group: captureorder-variables # Variable Group containing  'teamName', 'mongoHost', 'mongoUser' and the secret 'mongoPassword'
+
+  - name: dockerRegistryServiceConnection
+    value: 'containerRegistryConnection' # replace with container registry service connection name established during pipeline creation
+  
+  - name: imageRepository
+    value: 'captureorder' # replace with your own image name to match the name in the deployment.yaml
+
+  - name: tag
+    value: '$(Build.BuildId)'
+
+stages:
+- stage: Build
+  displayName: Build stage
+  jobs:  
+  - job: Build
+    displayName: Build job
+    pool:
+      vmImage: ubuntu-latest
+    steps:
+    - task: Docker@2
+      displayName: Build and push an image to container registry
+      inputs:
+        command: buildAndPush
+        repository: $(imageRepository)
+        dockerfile: '**/Dockerfile'
+        containerRegistry: $(dockerRegistryServiceConnection)
+        tags: |
+          $(tag)
+
+    - task: PublishPipelineArtifact@0
+      inputs:
+        artifactName: 'manifests'
+        targetPath: 'manifests'
+
+- stage: DeployDev
+  displayName: Deploy to dev stage
+  dependsOn: Build
+
+  variables:
+  - name: k8sNamespace # Kubernetes Namespace to deploy to
+    value: 'dev'
+      
+  jobs:
+  - deployment: DeployDev
+    displayName: Deploy to dev job
+    pool:
+      vmImage: ubuntu-latest
+
+    environment: 'aksworkshop.dev' # name of the environment to target. This will pull in the Kubernetes service connection automatically
+
+    strategy:
+      runOnce:
+        deploy:
+          steps:
+          - task: DownloadPipelineArtifact@1
+            inputs:
+              artifactName: 'manifests'
+              downloadPath: '$(System.ArtifactsDirectory)/manifests'
+
+          - task: KubernetesManifest@0
+            displayName: Create imagePullSecret from dockerRegistryServiceConnection
+            inputs:
+              action: createSecret
+              secretName: acr-auth
+              namespace: $(k8sNamespace)
+              dockerRegistryEndpoint: $(dockerRegistryServiceConnection)
+
+          - task: KubernetesManifest@0
+            displayName: Create secret for MongoDB
+            inputs:
+              action: createSecret
+              secretName: mongodb
+              secretType: generic
+              namespace: $(k8sNamespace)
+              secretArguments: --from-literal=mongoHost=$(mongoHost) --from-literal=mongoUser=$(mongoUser) --from-literal=mongoPassword=$(mongoPassword)
+
+          - task: KubernetesManifest@0
+            displayName: Deploy to Kubernetes cluster
+            inputs:
+              action: deploy
+              namespace: $(k8sNamespace)
+              manifests: $(System.ArtifactsDirectory)/manifests/*
+              imagePullSecrets: |
+                acr-auth
+              containers: |
+                $(imageRepository):$(tag)
+
+          - task: KubernetesManifest@0
+            displayName: Patch the deployment environment variables
+            inputs:
+              action: patch
+              resourceToPatch: name
+              name: $(imageRepository) 
+              kind: Deployment
+              namespace: $(k8sNamespace)
+              patch: '{"spec": {"template": {"spec":{"containers":[{"name":"$(imageRepository)","env":[{"name":"TEAMNAME","value":"$(teamName)"}]}]}}}}' # replacing TEAMNAME with the value specified in the variables

manifests/README.md

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+# What is the directory
+
+Add your Kubernetes manifest files (YAML) here and setup the pipeline to pick up the files for deployment to your Kubernetes cluster using the [KubernetesManifest](https://docs.microsoft.com/en-us/azure/devops/pipelines/tasks/deploy/kubernetes-manifest) task of Azure DevOps Pipelines.

manifests/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: captureorder
+spec:
+  selector:
+      matchLabels:
+        app: captureorder
+  replicas: 2
+  template:
+      metadata:
+        labels:
+            app: captureorder
+      spec:
+        containers:
+        - name: captureorder
+          image: sabbour.azurecr.io/captureorder # replace with your own repository
+          imagePullPolicy: Always
+          readinessProbe:
+            httpGet:
+              port: 8080
+              path: /healthz
+          livenessProbe:
+            httpGet:
+              port: 8080
+              path: /healthz
+          resources:
+            requests:
+              memory: "64Mi"
+              cpu: "100m"
+            limits:
+              memory: "128Mi"
+              cpu: "500m"
+          env:
+          - name: TEAMNAME
+            value: 'placeholder' # will be patched at deployment time by value of 'teamName' in the variable group
+          - name: MONGOHOST
+            valueFrom:
+              secretKeyRef:
+                name: mongodb
+                key: mongoHost
+          - name: MONGOUSER
+            valueFrom:
+              secretKeyRef:
+                name: mongodb
+                key: mongoUser
+          - name: MONGOPASSWORD
+            valueFrom:
+              secretKeyRef:
+                name: mongodb
+                key: mongoPassword
+          ports:
+          - containerPort: 80

manifests/hpa.yaml

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+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: captureorder
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: captureorder
+  minReplicas: 2
+  maxReplicas: 4
+  targetCPUUtilizationPercentage: 50

manifests/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: captureorder
+spec:   
+  type: LoadBalancer
+  ports:
+  - protocol: TCP
+    port: 80
+    targetPort: 8080
+  selector:
+    app: captureorder