WorkDir: Temporary fix to enable flake8 for local builds

Frank Winklmeierrequested to merge
fwinkl/athena:flake8_local into master

Temporarily set the flake8 variables directly in WorkDir until the proper fix in atlasexternals is deployed (ATLINFR-3229). This enables the flake8 checking for local compilation again.

Edited by Frank Winklmeier

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