Allow providing ATLANTIS_REPO_CONFIG_JSON as a YAML file

[nitrocode]

Is your request related to a new offering from AWS?

No

Is your request related to a problem? Please describe.

The problem is that people think the only way to provide this information is by using a json file which is untrue. Something like this can be used.

server-atlantis.yaml

repos:
  - id: /.*/
    # allow repo level custom workflows
    allow_custom_workflows: true
    # allow repo level configs to override the following
    allowed_overrides:
      - apply_requirements
      - workflow
    apply_requirements:
      - approved
    workflow: default

main.tf

module "atlantis" {
  source  = "terraform-aws-modules/atlantis/aws"
  version = "~> 2.30.0"

  custom_environment_variables = [
    # Override server config
    {
      "name" : "ATLANTIS_REPO_CONFIG_JSON",
      "value" : jsonencode(yamldecode(file("${path.module}/server-atlantis.yaml"))),
    },
  ]

  # ...
}

Describe the solution you'd like.

We could provide a couple inputs

• atlantis_repo_config_json
• atlantis_repo_config_yaml_file

Describe alternatives you've considered.

We could simply document the jsonencode(yamldecode(file( method

Additional context

#116

[antonbabenko]

Agree, PR is welcome :)

[nitrocode]

Great! I just wanted to open discussion for the different methods to do this.

Documenting it would be easy but an input variable would probably be better. If no one has an opinion, then I'd like to put in a PR for an input var.atlantis_repo_config_yaml_file.

[antonbabenko]

I think it will be fine if we ask users to pass it like this:

atlantis_repo_config_yaml_file  = jsonencode(yamldecode(file("${path.module}/server-atlantis.yaml")))

[antonbabenko]

Fixed in #205

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