I'm think the answer is yes, but wanted to confirm. I'm going to be using the prefect.yaml for my deployment, prefect can push docker images to aws ecr right?

Just have to add a login step before push. Try the below (may require some debugging)

build:
- prefect_docker.deployments.steps.build_docker_image:
    requires: prefect-docker
    id: build-image
    dockerfile: Dockerfile
    # should be something like
    # <http://0123456789.dkr.ecr.us-east-1.amazonaws.com/my-image|0123456789.dkr.ecr.us-east-1.amazonaws.com/my-image>
    image_name: "{{ prefect.blocks.secrets.secret-ecr-image }}"
    tag: latest
push:
- prefect.deployments.steps.run_shell_script:
    script: aws ecr get-login-password | docker login -u AWS --password-stdin "https://$(aws sts get-caller-identity --query 'Account' --output text).<http://dkr.ecr.us-east-1.amazonaws.com|dkr.ecr.us-east-1.amazonaws.com>"
- prefect_docker.deployments.steps.push_docker_image:
    requires: prefect-docker
    image_name: "{{ build-image.image_name }}"
    tag: "{{ build-image.tag }}"

ty 😎