Restore ability to set compile cache with env var PIP_TOOLS_CACHE_DIR #1368
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Fixes bug introduced in #1238 and exposed by #1357
#1238's intent was to remove unnecessary environment variable handling that pip was taking care of. This pip-tools environment variable was an accidental casualty. This became apparent when parallel tests proved unstable, due to a shared cache path, while we already have an autouse fixture to isolate them (using
PIP_TOOLS_CACHE_DIR
env var).Changelog-friendly one-liner: Restore ability to set compile cache with env var
PIP_TOOLS_CACHE_DIR
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