CIF-2690: use environment variable to define cache version

[buuhuu]

Description

In case the cache tarball breaks this will give us the opportunity to use a new cache key per configuration.

Related Issue

CIF-2690

Motivation and Context

Build trouble shooting

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [X] I have signed the Adobe Open Source CLA.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [X] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes and the overall coverage did not decrease.
• [X] All unit tests pass on CircleCi.
• [X] I ran all tests locally and they pass.

[codecov[bot]]

Codecov Report

Merging #824 (078bfde) into master (28f2eef) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #824   +/-   ##
=========================================
  Coverage     89.42%   89.42%           
  Complexity     1872     1872           
=========================================
  Files           316      316           
  Lines          8323     8323           
  Branches       1254     1254           
=========================================
  Hits           7443     7443           
  Misses          629      629           
  Partials        251      251           

Flag	Coverage Δ
integration	54.94% <ø> (ø)
jest	86.40% <ø> (ø)
karma	94.83% <ø> (ø)
unittests	88.85% <ø> (ø)

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