Drone: Add debug build

[Flamefire]

Catch assertion failures etc.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (550fe7a) 95.71% compared to head (65c00bc) 94.78%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #219      +/-   ##
===========================================
- Coverage    95.71%   94.78%   -0.93%     
===========================================
  Files          116      109       -7     
  Lines         9920     8980     -940     
===========================================
- Hits          9495     8512     -983     
- Misses         425      468      +43     

see 55 files with indirect coverage changes

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