Include coverage in a weekly test

[namurphy]

The code coverage reports have been acting a little weird lately. In #2598, for example, the BASE commit is from two months ago (with the nearest commits being #2477, #2478, & #2481). This PR is an attempt to get coverage reports uploaded from main.

Even if this PR does work, it's more of a patch 🩹 rather than a complete fix. It might be helpful to set it up so that the coverage test gets run every time a pull request is merged.

It may also be that we have code coverage set up incorrectly, or that the github token expired or something.

[namurphy]

After this and #2613 were merged, I ended up getting the following error. I'm debating which of the following emoji to respond with: 🤔 😿 😐 😅 🤦 🆘 😭 😬 🔒 🔑 🏳 🥦

gpg: directory '/Users/runner/.gnupg' created
gpg: /Users/runner/.gnupg/trustdb.gpg: trustdb created
gpg: key 806BB28AED779869: public key "Codecov Uploader (Codecov Uploader Verification Key) <[email protected]>" imported
gpg: Total number processed: 1
gpg:               imported: 1
gpg: Signature made Thu Mar 28 15:15:56 2024 UTC
gpg:                using RSA key 27034E7FDB850E0BBC2C62FF806BB28AED779869
gpg: Good signature from "Codecov Uploader (Codecov Uploader Verification Key) <[email protected]>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 2703 4E7F DB85 0E0B BC2C  62FF 806B B28A ED77 9869
==> Uploader SHASUM verified (cb250ac4addcd9a21bf1c73d583cdae0e7fbd2c369350829fcc21ffb55ca81e6  codecov)
info - 2024-04-03 21:10:30,676 -- ci service found: github-actions
Error: Codecov token not found. Please provide Codecov token with -t flag.

I guess I need to set up the Codecov token?