cml runner allow for a user set subnet

[dacbd]

Follow up for: iterative/terraform-provider-iterative#323 when complete.

Closes #795

[DavidGOrtega]

👍

[DavidGOrtega]

@dacbd 🙏
Is this ready?

[dacbd]

I'm 98% sure it's good, but I plan to play with it today, I'll mark ready after.

[dacbd]

@DavidGOrtega I am satisfied

tested with:

./bin/cml.js runner \
    --single \
    --idle-timeout=360 \
    --token=*** \
    --cloud=aws \
    --cloud-region=us-west-2 \
    --cloud-type=t3.medium \
    --repo=https://github.com/P*** \
    --cloud-aws-security-group=github-actions-test \
    --cloud-aws-subnet-id=subnet-06ee5a8e940002c2d \
    --driver=github

and worked as expected.

I'll probably put together a little demo of all these features I've pushed if interested.