dawarich/config/initializers/web_app_manifest.rb

# This file was generated by rails_favicon_generator, from
# https://realfavicongenerator.net/

# It makes files with .webmanifest extension first class files in the asset
# pipeline. This is to preserve this extension, as is it referenced in a call
# to asset_path in the _favicon.html.erb partial.

Rails.application.config.assets.configure do |env|
  mime_type = 'application/manifest+json'
  extensions = ['.webmanifest']

  if Sprockets::VERSION.to_i >= 4
    extensions << '.webmanifest.erb'
    env.register_preprocessor(mime_type, Sprockets::ERBProcessor)
  end

  env.register_mime_type(mime_type, extensions: extensions)

  # Register .webmanifest files with the correct MIME type
  # env.register_mime_type 'application/manifest+json', extensions: ['.webmanifest']
end