fix continuous build

build/azure-pipelines/linux/continuous-build-linux.yml

@@ -34,6 +34,12 @@ steps:
     vstsFeed: 'vscode-build-cache'
   condition: and(succeeded(), ne(variables['CacheRestored'], 'true'))
 
+- script: |
+    set -e
+    yarn postinstall
+  displayName: Run postinstall scripts
+  condition: and(succeeded(), eq(variables['CacheRestored'], 'true'))
+
 - script: |
     yarn electron x64
   displayName: Download Electron