Fix virtualenv in docker docks-builder

docker/docs/builder/Dockerfile

@@ -1,5 +1,5 @@
 # rebuild in #33610
-# docker build -t clickhouse/docs-build .
+# docker build -t clickhouse/docs-builder .
 FROM ubuntu:20.04
 
 # ARG for quick switch to a given ubuntu mirror
@@ -10,8 +10,6 @@ ENV LANG=C.UTF-8
 
 RUN apt-get update \
     && DEBIAN_FRONTEND=noninteractive apt-get install --yes --no-install-recommends \
-            python3-setuptools \
-            virtualenv \
             wget \
             bash \
             python \

docker/docs/check/run.sh

@@ -2,6 +2,7 @@
 set -euo pipefail
 
 cd $REPO_PATH/docs/tools
+rm -rf venv
 mkdir venv
 virtualenv -p $(which python3) venv
 source venv/bin/activate