ci: Updated header verification, env collection and docker job

[frgfm]

This PR introduces the following modifications:

• updates the env collection script for Windows
• updates the docker job
• updates the header verification job & the corresponding headers

Any feedback is welcome!

[codecov]

Codecov Report

Merging #147 (43f2d23) into master (eee9e54) will increase coverage by 0.49%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   89.16%   89.65%   +0.49%     
==========================================
  Files           8        8              
  Lines         203      203              
==========================================
+ Hits          181      182       +1     
+ Misses         22       21       -1     

Flag	Coverage Δ
unittests	89.65% <ø> (+0.49%)	⬆️

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Impacted Files	Coverage Δ
pyrovision/datasets/openfire.py	91.56% <ø> (ø)
pyrovision/datasets/utils.py	79.10% <ø> (+1.49%)	⬆️
pyrovision/models/mobilenetv3.py	100.00% <ø> (ø)
pyrovision/models/resnet.py	100.00% <ø> (ø)
pyrovision/models/rexnet.py	100.00% <ø> (ø)

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