ignore macos, run monthly

[martinfleis]

an attempt to fix the CI

[martinfleis]

@jGaboardi a question here is whether we need the CRON job at all. This tracks the version of the env used for the paper and should not change since we have a lock file in place. So maybe not needed to keep it around?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.89%. Comparing base (c1c205e) to head (7e88932).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #283   +/-   ##
=======================================
  Coverage   75.89%   75.89%           
=======================================
  Files          10       10           
  Lines         278      278           
=======================================
  Hits          211      211           
  Misses         67       67           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[jGaboardi]

Sure -- let's drop the CRON job