Change Maglev CMS uploader (asset management) to use Shrine instead of Active Storage.

• Maglev 1.2+ (might work with earlier versions, but it's untested)
• Shrine 3.5+ (might work with earlier versions, but it's untested)

Add the gem to your Gemfile and run bundle install:

gem 'maglevcms-shrine'

Generate migration, run migrations and add a new initializer to configure the gem:

bundle exec rails g maglev:shrine:install

No changes are required from the application side. The gem takes care of doing all the necessary changes so Maglev starts using Shrine.

NOTE: Active Storage needs to still be loaded in the application because app/controllers/maglev/api/assets_controller.rb in the maglev-core gem uses it.

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

• Add specs.