Stage Rails 5.X upgrade
Main tasks are:
- update crabgrass-media
- get rid of prototype-rails (use compatible prototype-rails branch)
- make tests pass with rails 5.1
- get rid of deprecation warnings for rails 5.2
- make tests pass with rails 5.2
- deploy on staging server
- make file upload 'work' as in production
- initial tests by ourselves
- get logs to work on staging
- invite external people to test
- check configuration parameters changed in rails 5.2
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information