Azure VM Image Builder service will be generally available Q3 2020

Unify and simplify your image building process across Azure and Azure Stack using Azure VM Image Builder. It helps give you ease of use with automated image building pipeline, management for the images you’ve built, and DevOps integration with Azure DevOps and other DevOps management solutions you use. In addition, it enables Azure integration for governance and compliance with virtual network configuration and connectivity via enterprise networking options and authentication.
Source: Azure Roadmap