結論
ダメ
execute 'foobar' do command 'first_awesome_command' command 'second_awesome_command' end
OK
execute 'foobar' do command 'first_awesome_command && second_awesome_command' end
execute 'foobar' do command 'first_awesome_command' command 'second_awesome_command' end
execute 'foobar' do command 'first_awesome_command && second_awesome_command' end