add new CI workflows (fixes #2129)

[kadyb]

If everything works, then I think we can remove tic.yml, update-tic.yml (and related badges in README), and tic.R.

[edzer]

Great, thanks!

[kadyb]

One more thing I missed. Previously in tic.yml there was cron set up, but currently it isn't, so maybe you want to restore it in rcmdcheck.yml. I mean:

on:
  push:
    branches: [main, master]
  pull_request:
    branches: [main, master]
  schedule:
    - cron: "0 4 * * *"