Publish to public ECR

[asieira]

Since Docker changed its policies, update the repo to use CircleCI or GitHub actions to publish the built images to a public ECR repository.

[Harshu1441]

Hi there! I am doing research on REST APIs and building Docker images when I came across your repository, and I believe I can help. I've noticed that Docker's policies have changed, and I'd be delighted to assist in updating this repository. My proposal is to use GitHub Actions for building and publishing Docker images to a public ECR repository.