refactor: add banned keyword.

Author: liqiang-fit2cloud

installer/Dockerfile-base

@@ -40,7 +40,7 @@ ENV PGDATA=/opt/maxkb/data/postgresql/pgdata \
     LANG=en_US.UTF-8 \
     MAXKB_LOG_LEVEL=INFO \
     MAXKB_SANDBOX_PYTHON_PACKAGE_PATHS="/opt/py3/lib/python3.11/site-packages,/opt/maxkb-app/sandbox/python-packages,/opt/maxkb/python-packages" \
-    MAXKB_SANDBOX_PYTHON_BANNED_KEYWORDS="subprocess.,system(,exec(,pty.,eval(,compile(,shutil.,input(" \
+    MAXKB_SANDBOX_PYTHON_BANNED_KEYWORDS="subprocess.,system(,exec(,pty.,eval(,compile(,shutil.,input(,__import__" \
     MAXKB_ADMIN_PATH=/admin
 
 EXPOSE 6379