Optional build source type override. This is the type of build input source. Valid values include:

• BITBUCKET: The source code is in a Bitbucket repository.
• S3: The source code is in an Amazon Simple Storage Service (Amazon S3) input bucket.
• CODECOMMIT: The source code is in an AWS CodeCommit repository.
• GITHUB: The source code is in a GitHub repository.
• GITHUB_ENTERPRISE: The source code is in a GitHub Enterprise repository.