Set setting.AppURL as GITEA_ROOT_URL environment variable during pushes

[zeripath]

Fix #11738

Signed-off-by: Andrew Thornton art27@cantab.net

[codecov-commenter]

Codecov Report

Merging #12752 into master will decrease coverage by 0.02%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master   #12752      +/-   ##
==========================================
- Coverage   43.30%   43.28%   -0.03%     
==========================================
  Files         648      648              
  Lines       71762    71765       +3     
==========================================
- Hits        31079    31064      -15     
- Misses      35654    35668      +14     
- Partials     5029     5033       +4     

Impacted Files	Coverage Δ
cmd/serv.go	2.06% <0.00%> (-0.02%)	⬇️
models/helper_environment.go	93.33% <100.00%> (+0.22%)	⬆️
routers/repo/http.go	43.11% <100.00%> (+0.14%)	⬆️
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
modules/indexer/stats/db.go	52.17% <0.00%> (-8.70%)	⬇️
modules/git/utils.go	73.77% <0.00%> (-3.28%)	⬇️
models/unit.go	46.57% <0.00%> (-2.74%)	⬇️
modules/git/repo.go	49.23% <0.00%> (-1.53%)	⬇️
modules/queue/workerpool.go	58.77% <0.00%> (-1.23%)	⬇️
services/pull/pull.go	41.57% <0.00%> (-0.47%)	⬇️

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