Create Input based on terraform

[jerome-jutteau]

osc-cost currently supports two types of data input: outscale API and Json (from osc-cost output).

This issue would be to add a new type of input: terraform

osc-cost would read what outscale infrastructure would be created in total (not just what would be added or removed) as input and use outscale API for catalog input.

Use-cases:

• This would allow CI which are handling terraform to provide an output of what would be the new cost.
• Previous terraform cost could also be stored for comparaison and can possibly fail.
• This would allow a monitoring system to alert when price is over a specific threshold.

I first naïve approach would be to run:

terraform init
terraform plan -out=plan
terraform show -json plan > desc.json