Screenshot rake task

[MutazAshhab]

Could now automatically take screenshots of all social media sharing cards. As described in #1338.

Once #1340 is done we can add task("application:generate:cards").invoke to the daily rake task

[MutazAshhab]

CI build failed because of a segmentation fault. Something with sassc

https://app.travis-ci.com/github/openaustralia/publicwhip/jobs/560643935#L821

[mlandauer]

I've restarted the job on travis 🤞🏼

[MutazAshhab]

Another segmentation fault :|

[MutazAshhab]

On this github issue sass/sassc-ruby#197 it discusses the same problem with a previous version of sassc (2.3.0) another person using 2.4.0 had the same error sass/sassc-ruby#197 (comment).

A solution that worked for some is adding this snippet to config/initializers/assets.rb

Rails.application.config.assets.configure do |env|
  env.export_concurrent = false
end

[MutazAshhab]

@mlandauer could you take a look at this PR now. I'd like to know if there are any knock on affects after setting export_concurrent = false.

[mlandauer]

@mlandauer could you take a look at this PR now. I'd like to know if there are any knock on affects after setting export_concurrent = false.

Please make a separate pull request for the export_concurrent change. Then we can check on its own whether it can be safely rolled out to production. Similar to the other pull request I'm going to close this one and wait until you open a new pull request with a cleaned up version history.