Add migrate to docker

[joaobologna]

Description

Add both migration executable and .sql migration files to docker image.

Motivation and Context

With these changes, those who might want to execute migrations on other containers will be able to since all necessary files are available in the docker image.

How Has This Been Tested?

A docker image was built with the given changes, then executed - docker run <will-iam-image>. Once the service was available, I was able to run /postgres/migration on another docker container.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code has tests.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

Release strategy

This PR is not a breaking change, it can be deployed at any time.