add database seeding for admin user

prisma/seed.ts

@@ -0,0 +1,35 @@
+import { PrismaClient } from "@prisma/client";
+import * as argon2 from "argon2";
+import * as dotenv from "dotenv";
+
+dotenv.config();
+
+const prisma = new PrismaClient(); // Prisma client instance
+
+/**
+ * Seed the database with admin user
+ */
+async function main() {
+  const hashedPassword = await argon2.hash(
+    process.env.ADMIN_PASSWORD as string
+  );
+
+  await prisma.user.upsert({
+    where: { username: "admin" },
+    update: {},
+    create: {
+      name: "Admin User",
+      username: "admin",
+      password: hashedPassword,
+    },
+  });
+}
+
+main()
+  .then(async () => {
+    await prisma.$disconnect();
+  })
+  .catch(async (e) => {
+    console.error(e);
+    await prisma.$disconnect();
+  });