docker: Fix PYTHON_VERSION not propagating (#47877)
Summary:
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>
Fixes #{issue number}
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47877
Reviewed By: samestep
Differential Revision: D24929116
Pulled By: seemethere
fbshipit-source-id: 442f8eb13318c44735200dfbb2f88e4ca1d9a127
