Infer bazel-bin directory in release automation

[nkubala]

We should be able to infer the output directory for the binary when building with bazel, so we don't have to keep changing the hardcoded name whenever we make a change to the build process. Something like

bazel info | grep bazel-bin | cut -d' ' -f2 or bazel info bazel-bin

should give us enough to work with.