Fix: fiber not starting in lxcfs environment with CPU limits

[NewbieOrange]

No description provided.

[codecov]

Codecov Report

Merging #57 (390d77e) into main (b301f77) will decrease coverage by 0.02056%.
Report is 3 commits behind head on main.
The diff coverage is 100.00000%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main         #57         +/-   ##
===================================================
- Coverage   81.64642%   81.62586%   -0.02057%     
===================================================
  Files            854         854                 
  Lines          33661       33656          -5     
===================================================
- Hits           27483       27472         -11     
- Misses          6178        6184          +6     

Files	Coverage Δ
trpc/util/thread/cpu.cc	42.97521% <100.00000%> (ø)

... and 8 files with indirect coverage changes