Add build:sass step to auth-plugins

- Needed for css to be exported

Author: mofojed

packages/auth-plugins/package.json

@@ -29,7 +29,8 @@
   },
   "scripts": {
     "build": "cross-env NODE_ENV=production run-p build:*",
-    "build:babel": "babel ./src --out-dir ./dist --extensions \".ts,.tsx,.js,.jsx\" --source-maps --root-mode upward"
+    "build:babel": "babel ./src --out-dir ./dist --extensions \".ts,.tsx,.js,.jsx\" --source-maps --root-mode upward",
+    "build:sass": "sass --embed-sources --load-path=../../node_modules ./src:./dist"
   },
   "dependencies": {
     "@deephaven/components": "file:../components",