refactor: add SKIP_SUBMODULE_DEPS to postinstall

Author: jsjoeio

ci/dev/postinstall.sh

@@ -29,7 +29,11 @@ main() {
 
   install-deps test
   install-deps test/e2e/extensions/test-extension
-  install-deps lib/vscode
+  # We don't need these when running the integration tests
+  # so you can pass SKIP_SUBMODULE_DEPS
+  if [[ ! ${SKIP_SUBMODULE_DEPS-} ]]; then
+    install-deps lib/vscode
+  fi
 }
 
 main "$@"