Support building as Release on macOS CI

[ken-matsui]

No description provided.

[codecov]

Codecov Report

Merging #210 (d80f326) into master (6f6d0ca) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #210      +/-   ##
==========================================
- Coverage   65.63%   65.60%   -0.04%     
==========================================
  Files         101      101              
  Lines        5302     5300       -2     
==========================================
- Hits         3480     3477       -3     
- Misses       1822     1823       +1     

Impacted Files	Coverage Δ
include/poac/util/cfg.hpp	98.58% <ø> (-0.29%)	⬇️
tests/cfg.cpp	99.03% <ø> (-0.01%)	⬇️

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