Provide AWS Lambda with container image

[edxu96]

It's easy to use its Python runtime, but we can't download the database, as the file system is immutable. However, running everything in a container makes it possible.

• https://docs.aws.amazon.com/lambda/latest/dg/images-create.html
• https://docs.aws.amazon.com/lambda/latest/dg/python-image.html#python-image-instructions
• https://aws.amazon.com/blogs/compute/using-container-image-support-for-aws-lambda-with-aws-sam/

[edxu96]

Must use Amazon ECR, because other registries are not supported by Lambda Function. It charges a small amount of fee after one year free tier: