run integration tests nightly

[karawoo]

Intent

Runs integration tests on a nightly schedule in addition to on PRs. Since the integration tests include preview builds, this should help us catch cases when upcoming changes in Connect will break connectapi so we can quickly fix them.

Approach

Add a schedule trigger. If integration tests fail, we'll send a slack notification. Note I'm still waiting on a webhook so that part of things won't work yet until I get it and can create the appropriate repository secret.

Checklist

• Does this change update NEWS.md (referencing the connected issue if necessary)?
• Does this change need documentation? Have you run devtools::document()?
• Does this change resolve integration test failures for a preview build of Connect? If so (and if you are on the Connect team), please be sure to update the Connect changelog to reflect that users will need to upgrade their version of connectapi.

[jonkeane]

I'm good with this (also thank you for adding this!).

It's probably NBD either way, but I bet weekly would cover us well enough and save some electrons. But these tests aren't huge (they run on every PR anyway!) nightly is probably just fine.

[karawoo]

I'm good with this (also thank you for adding this!).

It's probably NBD either way, but I bet weekly would cover us well enough and save some electrons. But these tests aren't huge (they run on every PR anyway!) nightly is probably just fine.

sounds good, updated to run weekly on Mondays

[jonkeane]

Thanks for this!