build: activate sum.golang.org check

[sapk]

Following: #7745

[codecov-io]

Codecov Report

Merging #7782 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7782      +/-   ##
==========================================
- Coverage   41.32%   41.31%   -0.02%     
==========================================
  Files         474      474              
  Lines       63837    63837              
==========================================
- Hits        26383    26375       -8     
- Misses      34017    34024       +7     
- Partials     3437     3438       +1

Impacted Files	Coverage Δ
models/unit.go	62.16% <0%> (-5.41%)	⬇️
modules/process/manager.go	76.81% <0%> (-4.35%)	⬇️
models/gpg_key.go	55.83% <0%> (-0.84%)	⬇️

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