fix: file descriptor leak

[ishitasequeira]

Resolves issue #5779

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Signed off by Ishita Sequeira

[alexmt]

Thank you!

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@3e43eca). Click here to learn what that means.
The diff coverage is 62.50%.

❗ Current head 0de59ad differs from pull request most recent head 12a299f. Consider uploading reports for the commit 12a299f to get more accurate results

@@            Coverage Diff            @@
##             master    #6064   +/-   ##
=========================================
  Coverage          ?   40.93%           
=========================================
  Files             ?      147           
  Lines             ?    19729           
  Branches          ?        0           
=========================================
  Hits              ?     8077           
  Misses            ?    10541           
  Partials          ?     1111           

Impacted Files	Coverage Δ
reposerver/repository/repository.go	60.76% <ø> (ø)
util/helm/cmd.go	28.57% <0.00%> (ø)
util/db/gpgkeys.go	79.10% <100.00%> (ø)
util/gpg/gpg.go	68.00% <100.00%> (ø)

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[alexmt]

LGTM