Use MailHog to catch emails in the docker image

[nono]

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[codecov-io]

Codecov Report

Merging #356 into master will decrease coverage by -0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #356      +/-   ##
==========================================
- Coverage   72.82%   72.71%   -0.12%     
==========================================
  Files          88       88              
  Lines        7025     7025              
==========================================
- Hits         5116     5108       -8     
- Misses       1326     1330       +4     
- Partials      583      587       +4

Impacted Files	Coverage Δ
web/files/files.go	72.32% <0%> (-1.12%)	❌
pkg/vfs/file.go	80.72% <0%> (-0.84%)	❌

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