chore: use mysql.Config.FormatDSN

[nakamasato]

Close #186

[codecov]

Codecov Report

Merging #188 (c1b3a55) into main (fdf9006) will increase coverage by 0.39%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #188      +/-   ##
==========================================
+ Coverage   65.50%   65.90%   +0.39%     
==========================================
  Files           6        6              
  Lines         516      522       +6     
==========================================
+ Hits          338      344       +6     
  Misses        137      137              
  Partials       41       41              

Impacted Files	Coverage Δ
controllers/mysql_controller.go	61.40% <100.00%> (+5.84%)	⬆️

... and 2 files with indirect coverage changes

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