refactor: move vscode.sh to postinstall

package.json

@@ -10,7 +10,6 @@
   "repository": "https://github.com/cdr/code-server",
   "scripts": {
     "clean": "./ci/build/clean.sh",
-    "vscode": "./ci/dev/vscode.sh",
     "vscode:reset": "./ci/dev/reset-vscode.sh",
     "build": "./ci/build/build-code-server.sh",
     "build:vscode": "./ci/build/build-vscode.sh",
@@ -20,6 +19,7 @@
     "release:github-assets": "./ci/build/release-github-assets.sh",
     "test:standalone-release": "./ci/build/test-standalone-release.sh",
     "package": "./ci/build/build-packages.sh",
+    "postinstall": "cd lib/vscode && yarn ${CI+--frozen-lockfile}",
     "_____": "",
     "fmt": "./ci/dev/fmt.sh",
     "lint": "./ci/dev/lint.sh",