build_container: Allow pip to install system-wide

We are having `error: externally-managed-environment` after upgrading to
ubuntu:24.04. Remove `EXTERNALLY-MANAGED` file to allow pip to install
packages system-wide.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

Author: RuoqingHe

build_container.sh

@@ -49,6 +49,8 @@ if [ "$ARCH" != "riscv64" ]; then
     popd
 fi
 
+# Allow pip to install packages system wide
+rm /usr/lib/python3.12/EXTERNALLY-MANAGED
 pip3 install --no-cache-dir pytest pexpect boto3 pytest-timeout && apt purge -y python3-pip
 
 # Install rustup and a fixed version of Rust.