Fix initialization of sentry

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 74.84%. Comparing base (466d607) to head (aabd79d).

Files with missing lines	Patch %	Lines
cmd/courier/main.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #829      +/-   ##
==========================================
- Coverage   74.85%   74.84%   -0.01%     
==========================================
  Files         112      112              
  Lines       13274    13275       +1     
==========================================
  Hits         9936     9936              
- Misses       2629     2630       +1     
  Partials      709      709              

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