Add daemon interrupt test

systest/daemon_interrupt.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -eux
+
+DATADIR=$(mktemp -d)
+
+# Start the node in daemon mode in the background
+$NANO_NODE_EXE --daemon --network dev --data_path $DATADIR &
+NODE_PID=$!
+
+# Allow some time for the node to start up completely
+sleep 10
+
+# Send an interrupt signal to the node process
+kill -SIGINT $NODE_PID
+
+# Check if the process has stopped using a timeout to avoid infinite waiting
+if wait $NODE_PID; then
+    echo "Node stopped successfully"
+else
+    echo "Node did not stop as expected"
+    exit 1
+fi