Terraform Orb - Allow multiple var_file parameters

[steinybot]

Terraform permits passing multiple -var-file parameters and so the orb should too:

❯ terraform plan -var-file=cicd.tfvars -var-file=terraform.tfvars
Refreshing Terraform state in-memory prior to plan...

This is related to #106 in that either that issue or this issue is required in order to overcome the limitation in hashicorp/terraform#16197.

[danielflookovo]

CircleCI doesn't support passing multiple parameters with the same name, they are restricted by the YAML format in that respect.

You can achieve this in the Terraform Orb by passing a single var_file (or var/backend_config/backend_config_file) with a comma separated value. e.g.:

jobs:
  terraform_plan:
    executor: terraform/terraform-0_12
    steps:
    - checkout
    - terraform/plan:
        path: terraform/deployments/cluster
        workspace: gauges-uat
        var_file: env/nonprod.tfvars,env/common.tfvars

[steinybot]

Apologies, I should have read the docs more carefully:

var_file (string): Comma separater list of terraform var files

[steinybot]

In case anyone is interested here is the CircleCI feature request to add list/array parameters https://ideas.circleci.com/ideas/CCI-I-701.