System requirements support on Linux

[gaborcsardi]

Closes #426.

[codecov]

Codecov Report

❌ Patch coverage is 57.33216% with 483 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.54%. Comparing base (a87760f) to head (2785c7d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/sysreqs/mod.rs	35.98%	201 Missing ⚠️
src/pkg/doctor.rs	27.73%	86 Missing ⚠️
src/sysreqs/rules.rs	71.72%	54 Missing ⚠️
src/sysreqs/installed.rs	39.72%	44 Missing ⚠️
src/sysreqs/install.rs	71.71%	28 Missing ⚠️
src/solver.rs	8.69%	21 Missing ⚠️
src/rproj.rs	7.14%	13 Missing ⚠️
src/sysreqs/platform.rs	92.79%	8 Missing ⚠️
src/install.rs	0.00%	7 Missing ⚠️
src/pkg/install.rs	12.50%	7 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #429      +/-   ##
==========================================
- Coverage   63.99%   63.54%   -0.45%     
==========================================
  Files          71       77       +6     
  Lines       36282    37802    +1520     
==========================================
+ Hits        23219    24022     +803     
- Misses      13063    13780     +717     

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