feat: refine the new custom provider url:XXX

[favonia]

Closes #570.

[codecov]

Codecov Report

Merging #576 (095f9a7) into main (19a838a) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #576      +/-   ##
==========================================
+ Coverage   87.83%   87.96%   +0.13%     
==========================================
  Files          44       44              
  Lines        2178     2202      +24     
==========================================
+ Hits         1913     1937      +24     
  Misses        256      256              
  Partials        9        9              

Flag	Coverage Δ
unittests	87.96% <100.00%> (+0.13%)	⬆️

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Files Changed	Coverage Δ
internal/config/env_provider.go	100.00% <100.00%> (ø)
internal/provider/custom.go	100.00% <100.00%> (ø)

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