Rpc max connection env (#720)

* rpc_max_connections env

* remove .idea

.env.example

@@ -18,6 +18,7 @@ DEPLOYER_ACCOUNT_PRIVATE_KEY=0x0288a51c164874bb6a1ca7bd1cb71823c234a86d0f7b150d7
 
 # Kakarot Environment
 KAKAROT_RPC_URL=127.0.0.1:3030
+RPC_MAX_CONNECTIONS=100
 ## check `./deployments/katana/deployments.json` after running `make devnet`
 KAKAROT_ADDRESS=
 PROXY_ACCOUNT_CLASS_HASH=0x105356ebf9c56df723dc6952dae0cffd8f6e0c22281cf0ee7df8ddde60281c0

src/eth_rpc/mod.rs

@@ -36,7 +36,11 @@ pub async fn run_server(
 
     let service = ServiceBuilder::new().layer(cors);
 
-    let server = ServerBuilder::default().set_middleware(service).build(socket_addr.parse::<SocketAddr>()?).await?;
+    let server = ServerBuilder::default()
+        .max_connections(std::env::var("RPC_MAX_CONNECTIONS").unwrap_or("100".to_string()).parse().unwrap())
+        .set_middleware(service)
+        .build(socket_addr.parse::<SocketAddr>()?)
+        .await?;
 
     let addr = server.local_addr()?;