Provide Docker image to run the microservice

Summary:
The microservice is first compiled with a Rust nightly container,
then the produced binary is copied into the actual lightweight
final container.

Ref T1461

Test Plan: Run the container, fire request to port 8000.

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1461

Differential Revision: https://devcentral.nasqueron.org/D1890