Fix build version script

Author: SelahattinSert

azure-pipelines.yml

@@ -47,9 +47,10 @@ stages:
           - script: |
               echo "Setting BUILD_VERSION..."
               BUILD_VERSION=$(date +'%Y%m%d')-$(Build.SourceVersionShort)
-              echo "##vso[task.setvariable variable=BUILD_VERSION]$BUILD_VERSION"
+              echo "##vso[task.setvariable variable=BUILD_VERSION;isOutput=true]$BUILD_VERSION"
               echo "::add-mask::$BUILD_VERSION"
-            displayName: "Set Secret Build Version"
+              name: SetVersion
+              displayName: "Set Secret Build Version"
 
           - task: Docker@2
             displayName: Build Docker Image