Rails 7.1 (#94)

* Add Rails 7.1 to appraisals
* Allow gem to be installed on Rails 7.1 bundles
* Fix backtrace cleaning for Rails 7.1 because ActionView::Template::Error now explicitly delegates backtrace to cause
* Add Rails 7.1 to Github Actions
* Bump rspec versions
* Make command more explicit in README
* Rails 7.1 now requires the template to be an UnboundTemplate instance, so we return that with backwards compat for Rails 6.1
* Don't bind locals on the cached unbound templates
* Upgrade dummy app to Rails 7.1 and add a regression test for children rendering bug in 7.1
* Fix empty children rendering bug in Rails 7.1. Because our children explicitly concat on @output_buffer, we should not return anything from capture block. This used to work anyway on Rails <7.1 but it no longer works

.github/workflows/main.yml

@@ -5,7 +5,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        gemfile: [rails_6_1, rails_7_0, rails_master]
+        gemfile: [rails_6_1, rails_7_0, rails_7_1, rails_master]
         # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
         ruby: [2.7, '3.0', 3.1]
     runs-on: ubuntu-latest

Appraisals

@@ -7,6 +7,10 @@ appraise "rails-7-0" do
   gem "rails", "~> 7.0.0"
 end
 
+appraise "rails-7-1" do
+  gem "rails", "~> 7.1.0"
+end
+
 appraise "rails-master" do
   gem "rails", git: "https://github.com/rails/rails.git", branch: :main
 end