Platform engineering is the discipline of designing and building toolchains and workflows that enable self-service capabilities for software engineering organizations in the cloud-native era.

Platform Engineering

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The policy in screenshot says that AWS's ECR service would be able to assume this role.

<https://aws.amazon.com/blogs/containers/sharing-amazon-ecr-repositories-with-multiple-accounts-using-aws-organizations/>

This step by step guide does what you need I guess