Update Dockerfile

Dockerfile

@@ -51,13 +51,14 @@ ENV POSTGRES_USER=${POSTGRES_USER} \
     DB_POSTGRESDB_USER=${POSTGRES_USER} \
     DB_POSTGRESDB_PASSWORD=${POSTGRES_PASSWORD} \
     DB_POSTGRESDB_DATABASE=${POSTGRES_DB} \
-    PATH="${VIRTUAL_ENV}/bin:/usr/local/lib/node_modules/n8n/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$PATH"
+    VIRTUAL_ENV=$WORKDIR/venv
+ENV PATH="$VIRTUAL_ENV/bin:/usr/local/lib/node_modules/n8n/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$PATH"
 
 # 复制构建阶段的 Node.js 和 n8n
 COPY --from=builder /usr/local/bin/node /usr/local/bin/
 COPY --from=builder /usr/local/lib/node_modules /usr/local/lib/node_modules
 # 复制构建阶段的 Python 运行环境
-COPY --from=builder ${VIRTUAL_ENV} ${VIRTUAL_ENV}
+COPY --from=builder $VIRTUAL_ENV $VIRTUAL_ENV
 
 # 安装必要的软件包并设置时区
 RUN apt-get update && apt-get install -y \