Add flatpack packaging files

[naaando]

No description provided.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 6.45%. Comparing base (c4122f6) to head (1ac2627).
Report is 1 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master     #57   +/-   ##
======================================
  Coverage    6.45%   6.45%           
======================================
  Files          40      40           
  Lines        1301    1301           
  Branches      618     618           
======================================
  Hits           84      84           
  Misses       1134    1134           
  Partials       83      83           

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