Only set tag for releases

.ci/azure-pipelines.yml

@@ -42,6 +42,7 @@ jobs:
 
     steps:
       - script: 'echo "##vso[task.setvariable variable=JELLYFIN_VERSION]$(git describe --tags)"'
+        condition: startsWith(variables['Build.SourceBranch'], 'refs/tags')
         displayName: 'Set Version Variable'
 
       - task: Gradle@2