Update Dockerfile

[k1LoW]

Use alpine:latest

[codecov]

Codecov Report

Merging #323 (4c37754) into main (b1f2849) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
- Coverage   67.00%   66.93%   -0.07%     
==========================================
  Files          26       26              
  Lines        4334     4334              
==========================================
- Hits         2904     2901       -3     
- Misses       1137     1139       +2     
- Partials      293      294       +1     

Impacted Files	Coverage Δ
datasource/datasource.go	40.14% <0.00%> (-2.12%)	⬇️

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