Fix env check

Author: TyHil

src/env.mjs

@@ -8,7 +8,13 @@ const server = z.object({
   NODE_ENV: z.enum(['development', 'test', 'production']),
   DATABASE_URL: z.string().min(1),
   BETTER_AUTH_SECRET: z.string().min(1),
-  BETTER_AUTH_URL: z.string().min(1),
+  BETTER_AUTH_URL: z.preprocess(
+    // This makes Vercel deployments not fail if you don't set BETTER_AUTH_URL
+    // Since Better Auth automatically uses the VERCEL_URL if present.
+    (str) => process.env.VERCEL_URL ?? str,
+    // VERCEL_URL doesn't include `https` so it cant be validated as a URL
+    process.env.VERCEL ? z.string().min(1) : z.string().url(),
+  ),
   DISCORD_CLIENT_ID: z.string().min(1),
   DISCORD_CLIENT_SECRET: z.string().min(1),
   GOOGLE_CLIENT_ID: z.string().min(1),