Added alpine 3.13 and 3.14 into building test.

[limingxinleo]

No description provided.

[codecov]

Codecov Report

Merging #4309 (a6c168e) into master (9168c1a) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4309      +/-   ##
==========================================
- Coverage   50.62%   50.60%   -0.03%     
==========================================
  Files          72       72              
  Lines       14508    14508              
==========================================
- Hits         7345     7342       -3     
- Misses       7163     7166       +3     

Impacted Files	Coverage Δ
src/protocol/base.cc	61.18% <0.00%> (-1.98%)	⬇️
src/server/port.cc	50.00% <0.00%> (-0.28%)	⬇️
src/os/async_thread.cc	69.73% <0.00%> (+0.43%)	⬆️

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