include sprockets-rails in dependencies for rails 7.0.0 tests

Not sure if this is really the best way to test, but it gets tests to pass for now. We're trying to test cocoon works with our attributes, and I guess cocoon is currently only doing sprockets though... so I guess it is best.

Maybe we should include our own cocoon-like JS via some other method in the future... nathanvda/cocoon#555

Appraisals

@@ -45,6 +45,10 @@ appraise "rails-7-0" do
   gem "rails", "~> 7.0.0"
   gem "pg", "~> 1.0"
 
+  # to make our integration tests using simple_form work as-is,
+  # this works. Don't totally underestand the actual simple_form
+  # setup paths in Rails 7....
+  gem "sprockets-rails"
 end
 
 appraise "rails-edge" do
@@ -53,8 +57,8 @@ appraise "rails-edge" do
   gem "rails", git: "https://github.com/rails/rails.git", branch: "main"
   gem "pg", "~> 1.0"
 
-  # Current rails 7 master doesn't have sprockets-rails as a dependency.
-  # We don't actually USE sprockets, but we're using "combustion"
-  # gem for rails app setup, which is assumign it. So.
+  # We do some tests using cocoon, currently via sprockets-rails,
+  # which is not automatically available in Rails 7.  Not sure
+  # the future of cocoon in general. https://github.com/nathanvda/cocoon/issues/555
   gem "sprockets-rails"
 end

gemfiles/rails_7_0.gemfile

@@ -14,5 +14,6 @@ gem "capybara", "~> 3.0"
 gem "webdrivers", "~> 4.0"
 gem "selenium-webdriver"
 gem "byebug"
+gem "sprockets-rails"
 
 gemspec path: "../"