Fix yarn issue during deploy

When running `rake assets:precompile`, `railties-6.1.0/lib/rails/tasks/yarn.rake` gets called
and since we don't have yarn installed it will cause an exception.

There is an issue on this: rails/rails#40795.

When fixed, this temporary fix should be removed.

lib/tasks/fix_yarn_issue.rake

@@ -0,0 +1,17 @@
+# FIXME: Remove this file when https://github.com/rails/rails/issues/40795 has a fix.
+
+Rake::Task[ "yarn:install" ].clear
+namespace :yarn do
+  desc "Disabling internal yarn install from Rails"
+  task install: :environment do
+    puts "Disabling internal yarn install from Rails"
+  end
+end
+
+Rake::Task[ "webpacker:yarn_install" ].clear
+namespace :webpacker do
+  desc "Disabling internal yarn install from Rails"
+  task yarn_install: :environment do
+    puts "Disabling internal yarn install from Rails"
+  end
+end