feat (login page): add a sign in / log in page

lib/prisma.ts

@@ -0,0 +1,21 @@
+import { PrismaClient } from "@/app/generated/prisma/client";
+import { PrismaPg } from "@prisma/adapter-pg";
+import { Pool } from "pg";
+
+const globalForPrisma = globalThis as unknown as {
+    prisma: PrismaClient | undefined;
+    pool: Pool | undefined;
+};
+
+const pool = globalForPrisma.pool ?? new Pool({
+    connectionString: process.env.DATABASE_URL,
+});
+
+const adapter = new PrismaPg(pool);
+
+export const prisma = globalForPrisma.prisma ?? new PrismaClient({ adapter });
+
+if (process.env.NODE_ENV !== "production") {
+    globalForPrisma.prisma = prisma;
+    globalForPrisma.pool = pool;
+}