Time scheduling

[art-w]

We currently run a benchmark on every new commit on the default branch and PRs. But there is also a need for daily, weekly and monthly reports to study long term progress, since it allows to run more intensive benchmarks that would be too slow and not representative on individual changes (see also https://github.com/ocurrent/current-bench/issues/23)

• [ ] We could extend the production.conf to enable this alternative time scheduling for repositories that requires it
• [ ] Since the really intensive benchmarks can block a worker for nearly a day, we could run them on a temporary server with Equinoxe to keep current-bench operational for the other repositories

[shakthimaan]

This will be useful for Sandmark nightly runs as well, especially for the Custom Variant Support feature request https://github.com/ocaml-bench/sandmark/issues/274.