Begrudgingly default to a retry on cucumber tests

Flaky cukes have been bugging us. A lot, sadly. Yes they should
be fixed but they seem rather hard to fix/not straight forward/
easy and it's a pretty bad experience for new contributors to have
their stuff fail to begin with.

Hence, retrying is the pragmatic approach here.

Author: PragTob

Rakefile

@@ -25,6 +25,8 @@ rescue LoadError
 end
 
 require "cucumber/rake/task"
-Cucumber::Rake::Task.new
+Cucumber::Rake::Task.new do |t|
+  t.cucumber_opts = %w[--retry 3]
+end
 
 task default: %i[rubocop spec cucumber]