Keep the list of groups

[joselsegura]

Description

This change add the prepared list of groups to the server instance in order to prevent its regeneration for each request

Fixes #135

Type of change

• Refactor (refactoring code, removing useless files)

Testing steps

Regular CI

[codecov-commenter]

Codecov Report

Merging #142 into master will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
+ Coverage   73.47%   73.54%   +0.07%     
==========================================
  Files           9        9              
  Lines         377      378       +1     
==========================================
+ Hits          277      278       +1     
  Misses         81       81              
  Partials       19       19              

Impacted Files	Coverage Δ
server/server.go	100.00% <ø> (ø)
server/handlers.go	46.66% <100.00%> (+1.83%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9e9f63b...fa89a2b. Read the comment docs.

[tisnik]

+1