Precompile assets and serve static files

Note: setting for serving static files is different in
rails 4 and rails 5.

setup-database-and-run-solidus.sh

@@ -1,7 +1,11 @@
 #!/bin/sh
 
+export RAILS_ENV=production
+export RAILS_SERVE_STATIC_FILES=true
+
 bundle exec rake db:create
 bundle exec rake db:migrate
 echo "no" | AUTO_ACCEPT=true bundle exec rake db:seed
+bundle exec rake assets:precompile
 
 bundle exec rails server