automatically sync distro master

build/azure-pipelines/distro-build.yml

@@ -24,6 +24,7 @@ steps:
 
     git remote add distro "https://github.com/$VSCODE_MIXIN_REPO.git"
     git fetch distro
+    git push distro master:distro/master
     git merge $(node -p "require('./package.json').distro")
 
   displayName: Merge Distro
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