chore: update storage configuration for production

- Change active storage service to use `:build` or `:amazon`
- Added a new `build` service for local disk storage

This update allows for better flexibility in managing file
storage based on the environment. The configuration now checks
the `RAILS_BUILD` environment variable to decide on the
storage service, making it easier to handle local testing and
production deployments without manual adjustments.

config/environments/production.rb

@@ -22,7 +22,7 @@ Rails.application.configure do
   # config.asset_host = "http://assets.example.com"
 
   # Store uploaded files on the local file system (see config/storage.yml for options).
-  config.active_storage.service = :amazon
+  config.active_storage.service = ENV["RAILS_BUILD"] ? :build : :amazon
 
   # Assume all access to the app is happening through a SSL-terminating reverse proxy.
   config.assume_ssl = true

config/storage.yml

@@ -6,6 +6,10 @@ local:
   service: Disk
   root: <%= Rails.root.join("storage") %>
 
+build:
+  service: Disk
+  root: <%= Rails.root.join("tmp/storage") %>
+
 # Use bin/rails credentials:edit to set the AWS secrets (as aws:access_key_id|secret_access_key)
 # amazon:
 #   service: S3