From https://once.com/writebook

config/initializers/active_storage.rb

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+ActiveSupport.on_load(:active_storage_blob) do
+  ActiveStorage::DiskController.after_action only: :show do
+    expires_in 1.year, public: true
+  end
+end

config/initializers/assets.rb

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+# Be sure to restart your server when you modify this file.
+
+# Version of your assets, change this if you want to expire all your assets.
+Rails.application.config.assets.version = "1.0"
+
+# Add additional assets to the asset load path.
+# Rails.application.config.assets.paths << Emoji.images_path

config/initializers/content_security_policy.rb

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+# Be sure to restart your server when you modify this file.
+
+# Define an application-wide content security policy.
+# See the Securing Rails Applications Guide for more information:
+# https://guides.rubyonrails.org/security.html#content-security-policy-header
+
+# Rails.application.configure do
+#   config.content_security_policy do |policy|
+#     policy.default_src :self, :https
+#     policy.font_src    :self, :https, :data
+#     policy.img_src     :self, :https, :data
+#     policy.object_src  :none
+#     policy.script_src  :self, :https
+#     policy.style_src   :self, :https
+#     # Specify URI for violation reports
+#     # policy.report_uri "/csp-violation-report-endpoint"
+#   end
+#
+#   # Generate session nonces for permitted importmap, inline scripts, and inline styles.
+#   config.content_security_policy_nonce_generator = ->(request) { request.session.id.to_s }
+#   config.content_security_policy_nonce_directives = %w(script-src style-src)
+#
+#   # Report violations without enforcing the policy.
+#   # config.content_security_policy_report_only = true
+# end

config/initializers/enable_yjit.rb

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+# Automatically enable YJIT as of Ruby 3.3, as it brings very
+# sizeable performance improvements.
+
+# If you are deploying to a memory constrained environment
+# you may want to delete this file, but otherwise it's free
+# performance.
+if defined? RubyVM::YJIT.enable
+  Rails.application.config.after_initialize do
+    RubyVM::YJIT.enable
+  end
+end

config/initializers/extensions.rb

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+Dir["#{Rails.root}/lib/rails_ext/*"].each { |path| require "rails_ext/#{File.basename(path)}" }

config/initializers/filter_parameter_logging.rb

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+# Be sure to restart your server when you modify this file.
+
+# Configure parameters to be partially matched (e.g. passw matches password) and filtered from the log file.
+# Use this to limit dissemination of sensitive information.
+# See the ActiveSupport::ParameterFilter documentation for supported notations and behaviors.
+Rails.application.config.filter_parameters += [
+  :passw, :email, :secret, :token, :_key, :crypt, :salt, :certificate, :otp, :ssn
+]

config/initializers/inflections.rb

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+ActiveSupport::Inflector.inflections(:en) do |inflect|
+  inflect.irregular "leaf", "leaves"
+end

config/initializers/markdown.rb

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+ActiveSupport.on_load :action_text_markdown do
+  require "markdown_renderer"
+  ActionText::Markdown.renderer = -> {  MarkdownRenderer.build }
+end

config/initializers/permissions_policy.rb

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+# Be sure to restart your server when you modify this file.
+
+# Define an application-wide HTTP permissions policy. For further
+# information see: https://developers.google.com/web/updates/2018/06/feature-policy
+
+# Rails.application.config.permissions_policy do |policy|
+#   policy.camera      :none
+#   policy.gyroscope   :none
+#   policy.microphone  :none
+#   policy.usb         :none
+#   policy.fullscreen  :self
+#   policy.payment     :self, "https://secure.example.com"
+# end

config/initializers/sqlite3.rb

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+module SQLite3Configuration
+  private
+    def configure_connection
+      super
+
+      if @config[:retries]
+        retries = self.class.type_cast_config_to_integer(@config[:retries])
+        raw_connection.busy_handler do |count|
+          (count <= retries).tap { |result| sleep count * 0.001 if result }
+        end
+      end
+    end
+end
+
+ActiveSupport.on_load :active_record do
+  ActiveRecord::ConnectionAdapters::SQLite3Adapter.prepend SQLite3Configuration
+end

config/initializers/version.rb

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+Rails.application.config.app_version = ENV.fetch("APP_VERSION", "0")
+Rails.application.config.git_revision = ENV["GIT_REVISION"]