we now publish build artifacts to an S3 bucket, by default
its release.rook.io. We no longer push bits to github on
make publish.
Added support for AWS cli in the cross-build container.
We know use alpine linux in containers to bring a few tool
dependencies we need including lsblk and others.
We know generate ACIs from docker containers instead of
creating ACIs with acbuild.
upload our containers to quay.io where they are automatically
converted to ACIs for use by rkt. Partially addresses #50
remove github-release as it was being flaky.
This commit adds support for build release artifacts and
publishing them. Currently we support binaries that are published
to github release, docker containers that go to hub.docker.com,
and rkt ACIs (which are not currently published).