github: Add GitHub Actions workflow.

This is an initial version of GitHub Actions support.  It mostly
mimics our current Travis CI build matrix with slight differences.

The main issue is that we don't have ARM support here.

Minor difference that we can not install 32-bit versions of libunwind
and libunbound since those are not avaialble in repository.

Higher concurrency level allows to finish all tests less than in 20
minutes.  Which is 3 times faster than in Travis.

.travis folder renamed to .ci to highlight that it used not only for
Travis CI.  Travis CI support will be reduced to only test ARM builds
soon and will be completely removed when travis-ci.org will be turned
into read-only mode.

What happened to Travis CI:
https://mail.openvswitch.org/pipermail/ovs-dev/2020-November/377773.html

Acked-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

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