Contribute: create test database

[m-bucher]

https://github.com/theforeman/theforeman.org/blob/9137547dd1b8deffa83508f1f6099d4c12955d95/contribute.md#setup-test-environment

Should this not rather be bundle exec bin/rake db:setup to create the database?

Furthermore, this describes the creation of the test-database, which IMHO would require to append a RAILS_ENV=test to the command.

[m-bucher]

Even better would probably be to use bundle exec rake db:create db:migrate RAILS_ENV=test.
Otherwise, it will not be correctly detected by this code in foreman: https://github.com/theforeman/foreman/blob/7b333c0082231c950e61b0dbc65375cf438e73b3/lib/foreman.rb#L23