Improve github actions

[Trolldemorted]

Some tweaks to your github actions:

• all operating systems and configurations in one matrix:

      matrix:
        os: [windows-latest, ubuntu-latest, macos-latest]
        profile: ['', --release]
        toolchain: [stable]
        features: ['']

• tests over all matrix variations (every os with every profile with every toolchain with every set of features)
• found two bugs already 🎉 (test_raw_fd_api fails on ubuntu sometimes #119, cargo build --features tokio fails to build on windows #120)
• daily scheduled build to detect problems with dependencies or the nightly compiler

I have deliberately not added the nightly toolchain and the features, because the build would fail due to the aforementioned bugs, but turning them on is just 1 loc change.

[sekineh]

Overall it looks like a very good infra!

Feature testing is crucial part of CI, please consider re-enable it again very soon.

[sekineh]

You disabled features testing (tokio, full).
If you enable tokio will CI fail? (Previously succeeded)

[sekineh]

Yes --features tokio fails. #120