[feature] add ability to create new service if it doesn't exist

[jrasell]

The requirement to have the ECS service running before using the plugin brings a couple of problems, specifically the duplication of configuration across drone and the initial creator application. It would be helpful if the plugin had the ability to create the service if it doesn't exist on the cluster, so the plugin can be used for the full service lifecycle.

[upUJTGifCXdJnqACJgxz]

Yesss! I find this requirement to be peculiar.

[josmo]

Sounds like it would be a nice addition :) If anyone wants to PR a change for that I'll totally merge it in. Otherwise I'll take a look when I get a chance but probably won't be super soon.