This tutorial provides a comprehensive guide for creating and deploying a Docker container image of a cloned .NET Core demo application, emphasizing the use of AWS Elastic Container Registry (ECR) and CircleCI for automation. It begins with the process of building a Docker image locally using a Dockerfile that includes development and production instructions. Once the image is built, the tutorial outlines steps to deploy it to Amazon ECR, illustrating how to manage user access and permissions through AWS IAM. It further explains the automation of the deployment process using CircleCI, specifically highlighting the use of the CircleCI AWS ECR orb to build, authenticate, and push images to the registry. The tutorial concludes by ensuring that Docker images are consistently updated with codebase changes, leveraging CircleCI to automate the integration and deployment workflows.