feat: rate limit api routes (#336)

* feat: install rate-limiter-flexible and ioredis

* feat: setup redis client

* feat: add withRateLimit wrapper

* feat: wrap trpc endpoint in withRateLimit

* feat: wrap withRateLimit on remaining routes

* feat: exclude webhook route from rate limiting

* chore: update compose files and readme

* refactor: move into api/db packages

packages/db/src/redis.ts

@@ -0,0 +1,31 @@
+import Redis from "ioredis";
+
+let redisClient: Redis | null = null;
+
+export function getRedisClient(): Redis | null {
+  if (redisClient) {
+    return redisClient;
+  }
+
+  const redisUrl = process.env.REDIS_URL;
+
+  if (!redisUrl) {
+    return null;
+  }
+
+  redisClient = new Redis(redisUrl, {
+    maxRetriesPerRequest: 3,
+    enableReadyCheck: true,
+    lazyConnect: true,
+  });
+
+  return redisClient;
+}
+
+export async function closeRedisClient(): Promise<void> {
+  if (redisClient) {
+    await redisClient.quit();
+    redisClient = null;
+  }
+}
+