End-to-end integration test for web+Grafana report execution

[speezepearson]

It is currently possible to make API requests that schedule a report for immediate execution. The only difficult part remaining is capturing the rendered-and-sent report out of MPortal: initiating connections from container to host is (IIUC) hard/wrong, so the IT can't just open an SMTP server and listen for the email.

Probable best long-term solution:

• add another Docker container that runs a mock SMTP server
• connect that SMTP server into MPortal's port 25
• somehow make API requests to the mock SMTP server to coax out information about the emails it received

Seems technically feasible, but arduous.

[vjkoskela]

For the email part, this looks promising:

https://hub.docker.com/r/mailhog/mailhog/