Remove hardcoded paths to fix randomly failing tests

[lafriks]

• Adds option for LOCAL_WIKI_PATH so that it would not be hardcoded
• Reuse local repository path when merging

[codecov-io]

Codecov Report

Merging #3347 into master will decrease coverage by 0.01%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master    #3347      +/-   ##
==========================================
- Coverage   35.04%   35.03%   -0.02%     
==========================================
  Files         280      280              
  Lines       40566    40571       +5     
==========================================
- Hits        14217    14214       -3     
- Misses      24246    24251       +5     
- Partials     2103     2106       +3

Impacted Files	Coverage Δ
modules/setting/setting.go	47.44% <ø> (ø)	⬆️
models/pull.go	51.87% <100%> (ø)	⬆️
models/wiki.go	62.5% <50%> (-0.81%)	⬇️
models/repo_indexer.go	52.91% <0%> (-0.98%)	⬇️
models/repo.go	43.19% <0%> (-0.19%)	⬇️

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[strk]

LGTM

[bkcsoft]

LGTM