ci: adding golang linter

[spoo-bar]

Closes: #239

• Added linter checking gh action
• Fixed existing linting issues in the repo where error return value was not checked

[codecov]

Codecov Report

Base: 69.77% // Head: 69.77% // No change to project coverage 👍

Coverage data is based on head (e2ddf25) compared to base (2568da8).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #241   +/-   ##
=======================================
  Coverage   69.77%   69.77%           
=======================================
  Files          57       57           
  Lines        3394     3394           
=======================================
  Hits         2368     2368           
  Misses        955      955           
  Partials       71       71           

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