Elekto needs comprehensive testing

[jberkus]

Currently, elekto has some limited E2E testing, mostly checking that the code loads without errors and that the vote tallying is correct.

This isn't enough. Here's the additional testing we need:

• unit tests for all modules, particularly ones that run as presubmit tests
• complete E2E testing that checks that an election can be created, run, and closed
• permissions testing that checks that pages are accessible in the correct user context
• container image testing on build

[nimbinatus]

Finally got some breathing room, so picking this up as promised (ok, promised nearly a year ago, but still promised). (Do slash commands work in this repo? I'm guessing not.)

[jberkus]

Nope!

If you wanna deploy Prow for Elekto, I'm fan. But it's probably overkill.