fix/db-connection

[SkYNewZ]

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Description

• Change docker image for fixing this issue Segmentation fault on Node 8 alpine (docker) sass/node-sass#2031
• clinet.connect() only once
• Use one variable DATABSE_CONNECTION_STING instead of 5 other variables

[codecov]

Codecov Report

Merging #26 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   98.18%   98.23%   +0.05%     
==========================================
  Files          11       11              
  Lines         165      170       +5     
  Branches       29       30       +1     
==========================================
+ Hits          162      167       +5     
  Partials        3        3

Impacted Files	Coverage Δ
src/routes/security.ts	100% <100%> (ø)	⬆️
src/config/config.ts	100% <100%> (ø)	⬆️

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