Continuous checking of repositories as tools are updated

[bradleyfalzon]

I'd like the ability for all my repositories to be rechecked continuously as new tools are added (or as a user, I enable new tools) and also catch existing issues as tools are updated.

• Don't check forks.
• Decide on the interval, perhaps every week or every 30 days.
• Decide on a mechanism to exclude existing issues i.e. just notify me on new issues discovered.

It's the latter part that may make this difficult.

[bradleyfalzon]

A workflow like this could occur:

1. Start gopherci-env container
2. Clone repo
3. Record the commit
4. Run tools
5. Record output
6. Update gopherci-env docker image
7. Push gopherci-env docker image
8. Start gopherci-env container
9. Clone repo
10. Check out recorded commit
11. Run tools
12. Record output
13. Diff two outputs

Note: this would mean #99 couldn't use this mechanism to detect new issues on unchanged lines.