Use dot ruby version

[alexskr]

• add .ruby_version file and set the version to 2.7.8
• enable rbenv capistrano task to improve deployments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.13%. Comparing base (0c52a25) to head (8df864f).
Report is 11 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #144   +/-   ##
========================================
  Coverage    73.13%   73.13%           
========================================
  Files           52       52           
  Lines         2903     2903           
========================================
  Hits          2123     2123           
  Misses         780      780           

Flag	Coverage Δ
unittests	73.13% <ø> (ø)

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