Use Anchor channels in CLN integration test

.. because they will be the new default.

Note the upcoming CLN 24.02 release will make Anchors default, too, but
for now we have to set the `experimental-anchors` config option.

docker-compose-cln.yml

@@ -63,6 +63,7 @@ services:
         "--bitcoin-rpcuser=user",
         "--bitcoin-rpcpassword=pass",
         "--regtest",
+        "--experimental-anchors",
       ]
     ports:
       - "19846:19846"

tests/integration_tests_cln.rs

@@ -5,7 +5,7 @@ mod common;
 use ldk_node::bitcoin::secp256k1::PublicKey;
 use ldk_node::bitcoin::Amount;
 use ldk_node::lightning::ln::msgs::SocketAddress;
-use ldk_node::{Builder, Event};
+use ldk_node::{Builder, ChannelType, Event};
 
 use clightningrpc::lightningrpc::LightningRPC;
 use clightningrpc::responses::NetworkAddress;
@@ -89,6 +89,7 @@ fn test_cln() {
 	common::wait_for_tx(&electrs_client, funding_txo.txid);
 	common::generate_blocks_and_wait(&bitcoind_client, &electrs_client, 6);
 	let user_channel_id = common::expect_channel_ready_event!(node, cln_node_id);
+	assert_eq!(node.list_channels().first().unwrap().channel_type, Some(ChannelType::Anchors));
 
 	// Send a payment to CLN
 	let mut rng = thread_rng();