Install python build package inside Winbase build container (#7934)

Author: mc-nv

build.py

@@ -1048,6 +1048,8 @@ def create_dockerfile_buildbase(ddir, dockerfile_name, argmap):
     # Install the windows- or linux-specific buildbase dependencies
     if target_platform() == "windows":
         df += """
+RUN python3 -m pip install build
+
 SHELL ["cmd", "/S", "/C"]
 """
     else: