Migration to Shrine attachment handling

config/initializers/shrine.rb

@@ -0,0 +1,21 @@
+# See also: https://github.com/erikdahlstrand/shrine-rails-example/blob/master/config/initializers/shrine.rb
+
+require "shrine"
+require "shrine/storage/file_system"
+
+# both `cache` and `store` storages are needed
+Shrine.storages = {
+  # Saves to ./public/screenshot/ID/image/…
+  cache: Shrine::Storage::FileSystem.new("public", prefix: "cache"),
+  store: Shrine::Storage::FileSystem.new("public", prefix: "/"),
+}
+
+# See plugin documentation at https://shrinerb.com/docs/plugins/activerecord
+Shrine.plugin :activerecord
+Shrine.plugin :instrumentation
+Shrine.plugin :determine_mime_type, analyzer: :marcel, log_subscriber: nil
+Shrine.plugin :cached_attachment_data
+Shrine.plugin :restore_cached_data
+Shrine.plugin :derivatives          # up front processing
+Shrine.plugin :derivation_endpoint, # on-the-fly processing
+  secret_key: Rails.application.secret_key_base