Configure CI via GitHub Actions

[ethercrow]

Example run: https://github.com/ethercrow/bytestring/actions/runs/326555407

It actually shows that there are some issues on Windows, presumably not in the library but in the test suite.

[Bodigrim]

Thanks! I do not have a Windows machine at the moment, will take a look at failing tests next week.

I wonder if #312, which removes unsafePerformIO from tests, could be relevant.

[Bodigrim]

This is getting interesting: Windows tests work fine for GHC 8.8, but fail for GHC 8.10.

[Bodigrim]

Since I can reproduce Windows failures locally, they are genuine issues (presumably with the test suite rather than with the library), and PR itself is good to be merged. Thanks!

[sjakobi]

Thanks, just a minor suggestion.

[sjakobi]

How about including haddocks, and particularly benchmarks? See

bytestring/.travis.yml

Lines 51 to 54 in 1f97c4c

	# Build the benchmarks and run a single iteration.
	- if [ "$GHCNUMVER" -ge 71000 ]; then
	(cd bench; cabal v2-bench -O0 --benchmark-options "--quick --min-duration=0 --include-first-iter");
	fi

[ethercrow]

Sure, added haddocks and benchmarks. They are visible in this run: https://github.com/ethercrow/bytestring/actions/runs/336677273

[sjakobi]

Just one more minor suggestion. Thanks!

[ethercrow]

Gentle tactical bump.

[sjakobi]

Thanks!