integration tests for minio rules

[jmelahman]

• Makes it easier to test changes, for example
• Improves ability to assert existing behavior doesn't regress
  • I think I broke the minio_archive rule in cc1c12a -- will send a followup to fix
• Acts as documentation for users

I can integrate to CI/CD via Github Actions in a follow up if that's interesting.

Depends on #8 and #14

[jmelahman]

Oof. These aren't versioned. I'll see if they support versioned releases otherwise, will remove the sha256 :/