fix: close image file handle

[jmattheis]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.00%. Comparing base (592dc45) to head (e34004c).

Files with missing lines	Patch %	Lines
api/application.go	25.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1071      +/-   ##
==========================================
- Coverage   76.09%   76.00%   -0.10%     
==========================================
  Files          67       67              
  Lines        3619     3625       +6     
==========================================
+ Hits         2754     2755       +1     
- Misses        654      657       +3     
- Partials      211      213       +2     

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