Fix: Bring back Doctrine checks

[localheinz]

This PR

• brings back Doctrine checks

Follows #110.

🤦‍♂

[codecov]

Codecov Report

Merging #111 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #111   +/-   ##
=========================================
  Coverage     94.54%   94.54%           
  Complexity       80       80           
=========================================
  Files            11       11           
  Lines           220      220           
=========================================
  Hits            208      208           
  Misses           12       12           

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