[DRE-maint] Bug#956508: gitlab: webpack should build assets in production mode

[vv221]

I think a side-effect of using production assets would be to fix
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=927297 as it adds a
unique hash to assets file names.

The hash would be different after each GitLab upgrade, so there should
no longer be cache issues for the GitLab instance users when they visit
it after an upgrade.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 488 bytes
Desc: OpenPGP digital signature
URL: <http://alioth-lists.debian.net/pipermail/pkg-ruby-extras-maintainers/attachments/20200412/1117a1cd/attachment.sig>