disable the version check of pip in Python packages by defining $PIP_DISABLE_PIP_VERSION_CHECK

[Flamefire]

When invoking pip it will connect to PyPI to check if a new version is available. Not only do we not care about that but we also don't want to connect to anything external which slows down the build at best or fails at worst.

Set the environment variable to disable this in the PythonPackage constructor such that it works for any easyblock deriving from it.

A few installations where I have found a message such as:

You should consider upgrading via the '/software/rome/r23.04/Python/3.10.4-GCCcore-11.3.0/bin/python -m pip install --upgrade pip' command.

• scipy (SciPy-bundle)
• LAMMPS
• TensorFlow
• pytest-shard
• pytest-rerunfailures

[Micket]

lgtm

[Micket]

Test report by @Micket

Overview of tested easyconfigs (in order)

• SUCCESS cryptography-42.0.8-GCCcore-13.3.0.eb
• SUCCESS pyproj-3.6.0-GCCcore-12.3.0.eb
• SUCCESS Mako-1.3.5-GCCcore-13.3.0.eb

Build succeeded for 3 out of 3 (3 easyconfigs in total)
vera-skylake-build - Linux Rocky Linux 8.9, x86_64, Intel Xeon Processor (Skylake, IBRS, no TSX), Python 3.6.8
See https://gist.github.com/Micket/fec912cc03eac282929641da8ca5bae5 for a full test report.