Build assets and sync them to an S3 bucket for GitLab.com
After we complete https://gitlab.com/gitlab-org/gitlab-ce/issues/40031 , we should add a step to our build process which would sync the assets to a S3 bucket.
We already have all assets built during our build. It should be trivial to add
another step to the process between staging upload and production release.
This step needs to use the asset_sync
gem to push the assets to a bucket. Bucket needs to be updated before we deploy to production as this would allow us to have all versions of assets, aiding the deploy.