Upgrade alpine to 3.8

[techknowlogick]

As title

[gaydin]

Is it possible to upgrade to 3.8 too?

gitea/Dockerfile

Line 4 in 268bbc9

FROM golang:1.11-alpine3.7 AS build-env

[techknowlogick]

@gaydin yup. Thank you for the suggestion. I've updated.

[codecov-io]

Codecov Report

Merging #5423 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5423      +/-   ##
==========================================
- Coverage   37.55%   37.54%   -0.01%     
==========================================
  Files         317      317              
  Lines       46832    46832              
==========================================
- Hits        17588    17585       -3     
- Misses      26744    26746       +2     
- Partials     2500     2501       +1

Impacted Files	Coverage Δ
modules/process/manager.go	76.81% <0%> (-4.35%)	⬇️

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