tools/make_pip: Use venv when invoking pip

Recent Ubuntu versions (24.04+) disallow pip by default when
installing packages. The recommended approach is to use a virtual
environment (venv) instead.
Because of this, "make pip" is failing on such versions.

To prepare CI container migration to Ubuntu 24.04, use a venv in the
make_pip script.

Note: This has been reported on [1]

[1] https://source.denx.de/u-boot/custodians/u-boot-dm/-/issues/37

Signed-off-by: Mattijs Korpershoek <mkorpershoek@kernel.org>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>

scripts/make_pip.sh

@@ -106,6 +106,10 @@ fi
 mkdir ${dir}/tests
 cd ${dir}
 
+# Use virtual environment
+python3 -m venv .venv
+source .venv/bin/activate
+
 # Make sure the tools are up to date
 python3 -m pip install --upgrade build
 python3 -m pip install --upgrade twine
@@ -122,6 +126,8 @@ if [ -n "${upload}" ]; then
 	echo "Completed upload of ${tool}"
 fi
 
+# Finish using virtual environment
+deactivate
 rm -rf "${dir}"
 
 echo -e "done\n\n"