FIX the failing netlify builds

[ndelangen]

Netlify will try to yarn install before running the script we provide.

We want to have more control before this process, to install some dependencies that -for some reason- do not install correctly.

What I did

I appended a --version to the yarn command that netlify uses before invoking the build script we provide.

This causes this install step to be skipped, and the build script to be executed immediately.

This seems to fix the issue.

[codecov]

Codecov Report

Merging #2527 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2527   +/-   ##
=======================================
  Coverage   16.87%   16.87%           
=======================================
  Files         307      307           
  Lines        7792     7792           
  Branches      782      784    +2     
=======================================
  Hits         1315     1315           
+ Misses       5853     5828   -25     
- Partials      624      649   +25

Impacted Files	Coverage Δ
app/vue/src/server/utils.js	0% <0%> (-53.58%)	⬇️
...ddons/actions/src/components/ActionLogger/index.js	5.26% <0%> (ø)	⬆️
...ents/src/manager/containers/CommentsPanel/index.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/api/index.js	0% <0%> (ø)	⬆️
addons/info/src/components/PropVal.js	41.41% <0%> (ø)	⬆️
app/react-native/src/preview/story_kind.js	0% <0%> (ø)	⬆️
...tive/src/preview/components/StoryListView/index.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/menu_item.js	19.14% <0%> (ø)	⬆️
addons/info/src/components/PropTable.js	21.36% <0%> (ø)	⬆️
addons/events/src/components/Event.js	0% <0%> (ø)	⬆️
... and 43 more

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