Fix prod build for macOS

[maciaszczykm]

GOOS is set automatically, no need to block it only for linux.

[floreks]

/lgtm

[k8s-ci-robot]

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[codecov]

Codecov Report

Merging #4235 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4235      +/-   ##
==========================================
+ Coverage   45.94%   45.95%   +0.01%     
==========================================
  Files         198      198              
  Lines        9298     9298              
  Branches      105      105              
==========================================
+ Hits         4272     4273       +1     
+ Misses       4766     4765       -1     
  Partials      260      260

Impacted Files	Coverage Δ
...p/backend/integration/metric/common/aggregation.go	90.9% <0%> (+1.81%)	⬆️

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[shu-mutou]

closes #4128