Retry build files task in cg.yml

Build/cg/cg.yml

@@ -98,9 +98,14 @@ extends:
         - script: mkdir $(Build.ArtifactStagingDirectory)\Extension
           displayName: Create Extension Staging Directory
 
-        - script: yarn run vsix-prepublish
+        - task: Bash@3
           displayName: Build files
-          workingDirectory: $(Build.SourcesDirectory)\Extension
+          inputs:
+            targetType: 'inline'
+            script: |
+              cd $(Build.SourcesDirectory)/Extension
+              yarn run vsix-prepublish
+          retryCountOnTaskFailure: 3
 
         - script: |
             cd $(Build.SourcesDirectory)\Extension