Reuse identical containers

[BenGalewsky]

As a container Service User I want to re-use identical containers so I can conserve resources

Assumptions

1. FuncX web service will compute a hash of the container spec
2. The hash will be done after some basic standardizations (sort the lists) - this will increase the likelihood of matching up identical containers
3. The hash will be saved in the container table
4. New container requests will have a hash computed. If the hash matches and the build status of that container is ready then just return the container UUID of the previous container request
5. If no successful match is found, go ahead and pass the request on to the container service.

Acceptance Criteria

Given I have successfully build a container for a spec When I submit a container build request for a functionally identical spec Then the container service is not invoked And I receive the UUID of the previously built container

Given I have successfully build a container for a spec When I submit a container build request for a different spec Then the container service is invoked And I receive a new UUID for the new container