Update azure-pipelines.yml for Azure Pipelines

azure-pipelines.yml

@@ -12,7 +12,7 @@ variables:
   dockerRegistryServiceConnection: 'docker-registry-olympus'
   imageName: 'apollo'
   shortCommitSha: ''
-  envName: 'aks-olympus'
+  envName: "aks-olympus"
 
 stages:
   - stage: Build
@@ -69,7 +69,7 @@ stages:
     displayName: Deploy stage
     jobs:
       - deployment: Deploy
-        displayName: "Deploy to $(envName)"
+        displayName: "Deploy to ${{variables.envName}}"
         condition: succeeded()
         pool:
           name: azureselfhosted