rails: disable asset pipeline.

Disable the assets pipeline (Sprockets). Sprockets errors out now after
upgrading to Sprockets 4 because of missing config files. We don't use
it any more after switching to Webpack, so we can disable it entirely.

Also disable a few more Rails features that we don't use (ActiveStorage,
ActionCable, ActionMailbox, ActionText).

config/environments/development.rb

@@ -29,7 +29,7 @@ Rails.application.configure do
   end
 
   # Store uploaded files on the local file system (see config/storage.yml for options).
-  config.active_storage.service = :local
+  # config.active_storage.service = :local
 
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false
@@ -48,10 +48,10 @@ Rails.application.configure do
   # Debug mode disables concatenation and preprocessing of assets.
   # This option may cause significant delays in view rendering with a large
   # number of complex assets.
-  config.assets.debug = true
+  # config.assets.debug = true
 
   # Suppress logger output for asset requests.
-  config.assets.quiet = true
+  # config.assets.quiet = true
 
   # Raises error for missing translations.
   # config.action_view.raise_on_missing_translations = true

config/environments/production.rb

@@ -26,7 +26,7 @@ Rails.application.configure do
   # config.assets.css_compressor = :sass
 
   # Do not fallback to assets pipeline if a precompiled asset is missed.
-  config.assets.compile = false
+  # config.assets.compile = false
 
   # Enable serving of images, stylesheets, and JavaScripts from an asset server.
   # config.action_controller.asset_host = 'http://assets.example.com'
@@ -36,7 +36,7 @@ Rails.application.configure do
   # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX
 
   # Store uploaded files on the local file system (see config/storage.yml for options).
-  config.active_storage.service = :local
+  # config.active_storage.service = :local
 
   # Mount Action Cable outside main process or domain.
   # config.action_cable.mount_path = nil

config/environments/staging.rb

@@ -29,11 +29,11 @@ Rails.application.configure do
   # config.assets.css_compressor = :sass
 
   # Do not fallback to assets pipeline if a precompiled asset is missed.
-  config.assets.compile = true
+  # config.assets.compile = true
 
   # Asset digests allow you to set far-future HTTP expiration dates on all assets,
   # yet still be able to expire them through the digest params.
-  config.assets.digest = true
+  # config.assets.digest = true
 
   # `config.assets.precompile` and `config.assets.version` have moved to config/initializers/assets.rb
 

config/environments/test.rb

@@ -31,7 +31,7 @@ Rails.application.configure do
   config.action_controller.allow_forgery_protection = false
 
   # Store uploaded files on the local file system in a temporary directory.
-  config.active_storage.service = :test
+  # config.active_storage.service = :test
 
   config.action_mailer.perform_caching = false