Add EC2 Task Runner

[anna-geller]

Feature description

We should add support for running tasks on Amazon EC2 instances directly (without Batch).

The user will need to specify (we can set sensible defaults e.g. to use Ubuntu AMI and query private subnet ID for the default VPC):

• the containerImage
• instanceType e.g. t2.micro
• imageId - AMI e.g. ami-0abcdef1234567890
• subnetId
• list of tags for cost tracking

Kestra should:

• output insensitive instance details like confirmation of the InstanceId, instanceType etc.
• capture execution logs
• terminate the instance after the task finishes and confirm that in the logs

[anna-geller]

Note that if the user chooses an instance type without Docker preinstalled, we can't run it as a container.

We should then log a friendly error message: "Your chosen AMI doesn't support Docker runtime. Please choose a different AMI for your instance. See the Amazon EC2 documentation for more details."

[myron-overton]

You could have the server alway choose the image. Because this type of task is an extension of the current server and not arbitrary task running. Therefore your build system would have to generate an API for of this extension on each release.

[anna-geller]

no no, actually we ideally want to enable running arbitrary commands -- for an extension of the current server, we have a feature called worker groups