Restrict CI triggers to master branch for push

[taichi-ishitani]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.89%. Comparing base (dcd8287) to head (4b1736a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #95   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files          15       15           
  Lines        1828     1828           
=======================================
  Hits         1826     1826           
  Misses          2        2           

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