update with project-syncing action

Author: github-actions

.devcontainer/devcontainer.json

@@ -26,7 +26,7 @@
   "otherPortsAttributes": {"onAutoForward": "ignore"},
 
   // Use 'postCreateCommand' to run commands after the container is created.
-  "postCreateCommand": "bin/setup",
+  "postCreateCommand": "bin/setup && gem install rufo && gem install htmlbeautifier",
 
   // Configure tool-specific properties.
   "customizations": {