ci: make static built binary available
ci: make static built binary available

This uploads the results of make release step (static binary and
a source tarball) so that they are available. I am not very sure if
it's of any use, but at least one can download and play with a static
binary from any PR.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

rhatdan/runc,opencontainers/runc,dqminh/runc,kolyshkin/runc,rhatdan/runc,opencontainers/runc,dqminh/runc,dqminh/runc,rhatdan/runc,kolyshkin/runc,kolyshkin/runc,opencontainers/runc,opencontainers/runc,rhatdan/runc,dqminh/runc,kolyshkin/runc