chore(ci): add test script to run build + validator for CI

Author: jetsung

package.json

@@ -12,7 +12,8 @@
     "serve": "npx serve -s -l 3000 dist",
     "clean": "node scripts/clean.js",
     "update:libs": "node scripts/update-libs.js",
-    "validate": "echo \"Running validation...\" && npm run lint && npm run build",
+    "validate": "node scripts/validate.js",
+    "test": "npm run build && node scripts/validate.js",
     "sign": "node scripts/sign.js",
     "sign:generate-key": "node scripts/sign.js --generate-key",
     "sign:chrome": "node scripts/sign.js --no-firefox",