Fix hook failure due to relative LFS_CONTENT_PATH

[zeripath]

Move LFS directory creation out of NewContext - this fixes hook and serv failures due to relative LFS_CONTENT_PATH

Fix #9481
(probably others too)

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

[codecov-io]

Codecov Report

Merging #11362 into master will decrease coverage by 0.03%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master   #11362      +/-   ##
==========================================
- Coverage   43.87%   43.83%   -0.04%     
==========================================
  Files         613      613              
  Lines       87226    87229       +3     
==========================================
- Hits        38272    38240      -32     
- Misses      44237    44266      +29     
- Partials     4717     4723       +6     

Impacted Files	Coverage Δ
modules/setting/setting.go	45.53% <50.00%> (+0.25%)	⬆️
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
modules/eventsource/manager_run.go	73.07% <0.00%> (-11.54%)	⬇️
models/repo_mirror.go	2.12% <0.00%> (-10.64%)	⬇️
modules/indexer/code/git.go	55.17% <0.00%> (-4.32%)	⬇️
modules/process/manager.go	74.69% <0.00%> (-3.62%)	⬇️
services/pull/temp_repo.go	31.62% <0.00%> (-2.57%)	⬇️
modules/queue/unique_queue_disk_channel.go	53.84% <0.00%> (-1.93%)	⬇️
modules/git/repo.go	49.79% <0.00%> (-1.26%)	⬇️
modules/log/event.go	64.61% <0.00%> (-1.03%)	⬇️
... and 3 more

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[lafriks]

Make lgtm work