Add a check to the Releaser workflow to ensure that the created/published release contains the expected assets. If it does not, create them and run the publish-release.sh script to upload the missing assets.

This came from https://github.com/filecoin-project/filecoin-ffi/blob/master/RELEASE.md and was brought up in #542 (comment), which was done as part of debugging why a lotus release failed (which ended up being because filecoin-ffi was missing artifacts).