ARM_CONTAINER not considered valid value for AWS::CodeBuild::Project.Environment.Type

[tilne]

cfn-lint version 0.33.0

When using a CFN template that contains an AWS::CodeBuild::Project resource whose Environment->Type is set to ARM_CONTAINER cfn-lint exits nonzero with the following error:

➜  cfn-lint --info ../cloudformation/cfn-lint-issue-example.json 
2020-06-12 08:09:02,170 - cfnlint.runner - INFO - Run scan of template ../cloudformation/cfn-lint-issue-example.json
E3030 You must specify a valid value for Type (ARM_CONTAINER).
Valid values are ["LINUX_CONTAINER", "WINDOWS_CONTAINER"]
../cloudformation/cfn-lint-issue-example.json:26:11

The full template is:

{
  "Resources": {
    "CodeBuildDockerImageBuilderProject": {
      "Type": "AWS::CodeBuild::Project",
      "Properties": {
        "Artifacts": {
          "Type": "NO_ARTIFACTS"
        },
        "Environment": {
          "ComputeType": "BUILD_GENERAL1_LARGE",
          "EnvironmentVariables": [
            {
              "Name": "AWS_REGION",
              "Value": {
                "Ref": "AWS::Region"
              }
            },
            {
              "Name": "AWS_ACCOUNT_ID",
              "Value": {
                "Ref": "AWS::AccountId"
              }
            }
          ],
          "Image": "aws/codebuild/amazonlinux2-aarch64-standard:1.0",
          "Type": "ARM_CONTAINER",
          "PrivilegedMode": true
        },
        "Name": "build-docker-images-project",
        "Source": {
          "Location": "some-bucket/docker/artifacts.zip",
          "Type": "S3"
        },
        "ServiceRole": "SomeServiceRole"
      }
    }
  }
}

The corresponding documentation lists this as a valid value.

Re-installing the latest version and running cfn-lint -u did not fix it.

[PatMyron]

As described here, this list will need to be updated:

https://github.com/aws-cloudformation/cfn-python-lint/blob/6cce9222c89056f1546f6fee068ce6dc9dfa394e/src/cfnlint/data/ExtendedSpecs/all/03_value_types/aws_codebuild.json#L46-L52