Allow set SEARCH_ROOT outside the script

[darakeon]

This is for allowing the script to be used inside automated environment, instead of someone manually installing talisman

[codecov[bot]]

Codecov Report

Merging #349 (d8f87ab) into master (17575b5) will decrease coverage by 2.48%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #349      +/-   ##
==========================================
- Coverage   72.29%   69.81%   -2.49%     
==========================================
  Files          31       33       +2     
  Lines        1451     1557     +106     
==========================================
+ Hits         1049     1087      +38     
- Misses        365      438      +73     
+ Partials       37       32       -5     

Impacted Files	Coverage Δ
utility/sha_256_hasher.go	37.73% <0.00%> (-62.27%)	:arrow_down:
scanner/scanner.go	15.09% <0.00%> (-3.09%)	:arrow_down:
cmd/pattern_cmd.go	100.00% <0.00%> (ø)
gitrepo/git_readers.go	0.00% <0.00%> (ø)
utility/progress_bar.go	45.00% <0.00%> (ø)
cmd/runner.go	83.33% <0.00%> (+0.72%)	:arrow_up:
talismanrc/entry-point.go	78.94% <0.00%> (+1.16%)	:arrow_up:
cmd/scanner_cmd.go	86.36% <0.00%> (+1.36%)	:arrow_up:
gitrepo/gitrepo.go	77.65% <0.00%> (+2.39%)	:arrow_up:
detector/helpers/detection_results.go	60.84% <0.00%> (+7.82%)	:arrow_up:
... and 3 more

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[darakeon]

@tinamthomas , did I broke the coverage? My change should not break this much