CI checks for unused variables

[RemDelaporteMathurin]

Fixes #268

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01% ⚠️

Comparison is base (a0aa6a8) 98.72% compared to head (804a342) 98.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #270      +/-   ##
==========================================
- Coverage   98.72%   98.71%   -0.01%     
==========================================
  Files          76       76              
  Lines        1800     1796       -4     
==========================================
- Hits         1777     1773       -4     
  Misses         23       23              

Files Changed	Coverage Δ
...ort_materials/property_database/alumina/alumina.py	100.00% <ø> (ø)
h_transport_materials/property_database/niobium.py	100.00% <ø> (ø)
...transport_materials/property_database/palladium.py	100.00% <ø> (ø)
..._transport_materials/property_database/vanadium.py	100.00% <ø> (ø)

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