Disable git fsck for mirrored repos by default

[adelowo]

No description provided.

[codecov-io]

Codecov Report

Merging #6018 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #6018      +/-   ##
==========================================
- Coverage   38.73%   38.71%   -0.02%     
==========================================
  Files         332      332              
  Lines       48992    48992              
==========================================
- Hits        18975    18967       -8     
- Misses      27269    27278       +9     
+ Partials     2748     2747       -1

Impacted Files	Coverage Δ
models/repo.go	47.24% <100%> (ø)	⬆️
models/unit.go	0% <0%> (-14.29%)	⬇️
models/repo_list.go	63.29% <0%> (-1.27%)	⬇️
routers/repo/view.go	46.1% <0%> (-1.2%)	⬇️

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