Create a build project without a source - Amazon CodeBuild
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Create a build project without a source

You can configure a CodeBuild project by choosing the NO_SOURCE source type when you configure your source. When your source type is NO_SOURCE, you cannot specify a buildspec file because your project does not have a source. Instead, you must specify a YAML-formatted buildspec string in the buildspec attribute of the JSON-formatted input to the create-project CLI command. It might look like this: 

{
  "name": "project-name",
  "source": {
    "type": "NO_SOURCE",
    "buildspec": "version: 0.2\n\nphases:\n  build:\n    commands:\n      - command"
   },
  "environment": {
    "type": "LINUX_CONTAINER",
    "image": "aws/codebuild/standard:5.0",
    "computeType": "BUILD_GENERAL1_SMALL",    
  },
  "serviceRole": "arn:aws:iam::account-ID:role/role-name",
  "encryptionKey": "arn:aws:kms:region-ID:account-ID:key/key-ID"
}

For more information, see Create a build project (Amazon CLI).