[DRE-maint] Bug#809707: sprockets 3.3 cannot find favico.js

[Pirate Praveen]

package: ruby-sprockets
version: 3.3.0-1
severity: grave
justification: fails to find assets previously found by 2.12

Sprockets::FileNotFound: couldn't find file 'favico.js' with type
'application/javascript'

It was noticed by autopkgtest in ruby-rails-assets-favico.js and
confirmed by checking gem installed rails-assets-favico.js from
rails-assets.org

rails new foo
cd foo

cat >> app/assets/javascripts/application.js <<EOF
# =require favico.js
EOF

cat >> Gemfile <<EOF
source "https://rails-assets.org" do
        gem 'rails-assets-favico.js'
end
EOF

bundle install
bundle exec rake assets:precompile


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