feat: add hostname as os context value

[rawkode]

Closes #200

[codecov-commenter]

Codecov Report

Merging #201 (ac9c335) into main (462dd15) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #201      +/-   ##
==========================================
+ Coverage   49.16%   49.24%   +0.07%     
==========================================
  Files          59       59              
  Lines        1975     1978       +3     
==========================================
+ Hits          971      974       +3     
  Misses       1004     1004              

Impacted Files	Coverage Δ
lib/src/contexts/os.rs	96.77% <100.00%> (+0.34%)	⬆️

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