add yarn gen before build

package.json

@@ -26,6 +26,7 @@
     "testShawn": "npm run build && node build/src/test.js",
     "faucetTuc": "npm run build && node build/src/faucet/faucetTuc.js",
     "clean": "rimraf coverage build tmp",
+    "prebuild": "yarn prisma generate",
     "build": "tsc -p tsconfig.json && tsc-alias",
     "build:watch": "tsc -w -p tsconfig.json && tsc-alias",
     "build:release": "npm run clean && tsc -p tsconfig.release.json && tsc-alias",