This updates our release process so that when we build an alpha of the
Codex CLI (as determined by pushing a tag of the format
`rust-v<cli-version>-alpha.<alpha-version>`), we will now publish the
corresponding npm module publicly, but under the `alpha` tag. As you can
see, this PR adds `--tag alpha` to the `npm publish` command, as
appropriate.
9336f2b84b
