use gomod support w/ xgo

[techknowlogick]

as title

[codecov-io]

Codecov Report

Merging #14836 (b612ace) into master (a4148c0) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #14836      +/-   ##
==========================================
- Coverage   42.15%   42.07%   -0.08%     
==========================================
  Files         774      774              
  Lines       82539    82539              
==========================================
- Hits        34794    34729      -65     
- Misses      42081    42149      +68     
+ Partials     5664     5661       -3     

Impacted Files	Coverage Δ
modules/forms/repo_form.go	25.16% <0.00%> (-12.59%)	⬇️
modules/forms/user_form.go	29.26% <0.00%> (-10.98%)	⬇️
modules/indexer/issues/indexer.go	51.79% <0.00%> (-8.21%)	⬇️
modules/avatar/avatar.go	50.00% <0.00%> (-4.77%)	⬇️
modules/indexer/code/bleve.go	65.04% <0.00%> (-4.43%)	⬇️
modules/charset/charset.go	68.53% <0.00%> (-2.25%)	⬇️
modules/indexer/code/elastic_search.go	0.00% <0.00%> (-1.73%)	⬇️
services/gitdiff/gitdiff.go	73.69% <0.00%> (-1.45%)	⬇️
services/pull/pull.go	41.66% <0.00%> (-0.50%)	⬇️
models/gpg_key.go	54.07% <0.00%> (+0.56%)	⬆️
... and 3 more

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