build: change base image to alpine

[jimyag]

now：

[netlify]

✅ Deploy Preview for reviewbot-x canceled.

Name	Link
🔨 Latest commit	2f16f60
🔍 Latest deploy log	https://app.netlify.com/sites/reviewbot-x/deploys/66686c1c1df2d500087fff1c

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.01%. Comparing base (2f96b9a) to head (2f16f60).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #155   +/-   ##
=======================================
  Coverage   37.01%   37.01%           
=======================================
  Files          10       10           
  Lines         824      824           
=======================================
  Hits          305      305           
  Misses        491      491           
  Partials       28       28           

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