This one does not have clear acceptance criteria and will be groomed as it's being performed. But the main ideas are:

• Check main projects (ex: those updated in the last 3 months)
• Import any Rake task that seems interesting to share into Shimmer
• Open PR to remove them from source projects
• Document their use

Examples are:

• db:migrate_if_tables
• db:reset:full
• sidekiq:clear / redis:reset / jobs:clear
• db:pull[prod]
• db:pull:newdb
• db:tmp:dump
• db:tmp:restore
• db:pull_assets
• jobs:inline
• jobs:delete:*