Setup docker env. for CLN integration checks

.github/workflows/cln.yml

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+name: Continuous Integration Checks - CLN
+
+on: [push, pull_request]
+
+jobs:
+  check-cln:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y socat
+
+      - name: Start bitcoind, electrs, and lightningd
+        run: docker compose -f docker-compose-cln.yml up -d
+
+      - name: Forward lightningd RPC socket
+        run: |
+          docker exec ldk-node-cln-1 sh -c "socat -d -d TCP-LISTEN:9937,fork,reuseaddr UNIX-CONNECT:/root/.lightning/regtest/lightning-rpc&"
+          socat -d -d UNIX-LISTEN:/tmp/lightning-rpc,reuseaddr,fork TCP:127.0.0.1:9937&
+
+      - name: Run CLN integration tests
+        run: RUSTFLAGS="--cfg cln_test" cargo test --test integration_tests_cln

docker-compose-cln.yml

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+version: '3'
+
+services:
+  bitcoin:
+    image: blockstream/bitcoind:24.1
+    platform: linux/amd64
+    command:
+      [
+        "bitcoind",
+        "-printtoconsole",
+        "-regtest=1",
+        "-rpcallowip=0.0.0.0/0",
+        "-rpcbind=0.0.0.0",
+        "-rpcuser=user",
+        "-rpcpassword=pass",
+        "-fallbackfee=0.00001"
+      ]
+    ports:
+      - "18443:18443"  # Regtest RPC port
+      - "18444:18444"  # Regtest P2P port
+    networks:
+      - bitcoin-electrs
+    healthcheck:
+      test: ["CMD", "bitcoin-cli", "-regtest", "-rpcuser=user", "-rpcpassword=pass", "getblockchaininfo"]
+      interval: 5s
+      timeout: 10s
+      retries: 5
+
+  electrs:
+    image: blockstream/esplora:electrs-cd9f90c115751eb9d2bca9a4da89d10d048ae931
+    platform: linux/amd64
+    depends_on:
+      bitcoin:
+        condition: service_healthy
+    command:
+      [
+        "/app/electrs_bitcoin/bin/electrs",
+        "-vvvv",
+        "--timestamp",
+        "--jsonrpc-import",
+        "--cookie=user:pass",
+        "--network=regtest",
+        "--daemon-rpc-addr=bitcoin:18443",
+        "--http-addr=0.0.0.0:3002",
+        "--electrum-rpc-addr=0.0.0.0:50001"
+      ]
+    ports:
+      - "3002:3002"
+      - "50001:50001"
+    networks:
+      - bitcoin-electrs
+
+  cln:
+    image: blockstream/lightningd:v23.08
+    platform: linux/amd64
+    depends_on:
+      bitcoin:
+        condition: service_healthy
+    command:
+      [
+        "--bitcoin-rpcconnect=bitcoin",
+        "--bitcoin-rpcport=18443",
+        "--bitcoin-rpcuser=user",
+        "--bitcoin-rpcpassword=pass",
+        "--regtest",
+      ]
+    ports:
+      - "19846:19846"
+      - "9937:9937"
+    networks:
+      - bitcoin-electrs
+
+networks:
+  bitcoin-electrs:
+    driver: bridge