feat(docker): add entrypoint script for graceful shutdown and application start

docker-entrypoint.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+set -e
+
+# Function to handle termination signals
+handle_term() {
+  echo "Received SIGTERM/SIGINT, shutting down gracefully..."
+  kill -TERM "$child"
+  wait "$child"
+  exit 0
+}
+
+# Set up signal handlers
+trap handle_term SIGTERM SIGINT
+
+# Start the application
+echo "Starting SimpleGuardHome server..."
+python -m simpleguardhome.main &
+
+# Store child PID
+child=$!
+
+# Wait for process to complete
+wait "$child"