chore: add postgres schema migrations

drizzle.config.ts

@@ -0,0 +1,11 @@
+import "dotenv/config";
+import { defineConfig } from "drizzle-kit";
+
+export default defineConfig({
+  schema: "./packages/db/src/schema/index.ts",
+  out: "./packages/db/src/migrations",
+  dialect: "postgresql",
+  dbCredentials: {
+    url: process.env.DATABASE_URL ?? "postgres://devflow:devflow@127.0.0.1:55432/devflow",
+  },
+});