Add workaround for yarn node-sass bug

[acburdine]

Workaround for yarnpkg/yarn#1981

Found in this commit: tjgrathwell/ng-picross@22d55c0

[coveralls]

Coverage remained the same at 81.069% when pulling 0ee3240 on acburdine:dammit-yarn into 7652969 on TryGhost:master.

[kevinansfield]

👍 let's see how it goes

[Headcult]

Same issue here, while using Yarn (0.21.3). It's failing at Heroku build (node-sass error). Even the suggested workaround did not work for me (before_script: - yarn add --force node-sass). Can we get a ETA on the fix for this as Travis CI is failing at Deploy stage due to Heroku build failure. Thank you.

[kevinansfield]

@Headcult we merged the fix in this PR on the 20th Jan and we haven't had any further issues with Travis failing to build Ghost-Admin. I understand you are having trouble but this is not the right repo to chase yarn issues, I see you've already posted the same message on the associated yarn issue - if you can keep the discussion there it will prevent any confusion by starting discussions in an unrelated project 😄

[Headcult]

Sorry @kevinansfield , repeated the issue here by mistake. Yes, I'll track this with Yarn through the other issue.