fix: use pnpm not npx for start command

Author: ralyodio

railway.json

@@ -1,11 +1,10 @@
 {
   "$schema": "https://railway.com/railway.schema.json",
   "build": {
-    "builder": "NIXPACKS",
-    "buildCommand": "pnpm install --frozen-lockfile && pnpm build"
+    "builder": "NIXPACKS"
   },
   "deploy": {
-    "startCommand": "sh -c 'npx next start -H 0.0.0.0 -p ${PORT:-3000}'",
+    "startCommand": "sh -c 'pnpm start -- -H 0.0.0.0 -p ${PORT:-3000}'",
     "restartPolicyType": "ON_FAILURE",
     "restartPolicyMaxRetries": 10
   }