Let me explain the purpose of ECR in the context of Prefect ECS workers and deployments. The ECR (Elastic Container Registry) repository serves a crucial purpose, but it's not automatically used unless you're specifically containerizing your flows. Here's when and why ECR becomes important: 1. Default Behavior (No ECR Required): - By default, when using an ECS worker, Prefect will use a base worker image that's publicly available - In this case, your flow code is injected into the container at runtime, and you won't see any images in your ECR repository 2. When ECR is Used: - ECR becomes necessary when you need to customize the execution environment for your flows - This typically happens when: - You have specific dependencies that aren't in the base image - You need custom system packages - You want to pre-package your flow code with its environment - You're working in an air-gapped environment where pulling public images isn't possible 3. Image Creation Process: - Images are only created and pushed to ECR when you explicitly build and push them - This usually happens when you create a deployment with a custom Docker build If you're not seeing any images in your ECR repository, it likely means: 1. You're using the default worker image (which is fine for many use cases) 2. You haven't yet created any deployments that specify custom Docker builds Would you like me to: 1. Explain how to create a custom Docker build for your flows that would use ECR? 2. Show you how to verify which image your current ECS worker is using? 3. Provide more details about any specific aspect of this setup? Let me know what would be most helpful for your use case!