[feat] add RPM release artifacts

Similarly to how bazelisk publishes `.deb` artifacts for Debian-based distributions, I would like bazelisk to provide `.rpm` artifacts as well, as RPM is a widely-used package format for Red Hat, Fedora, CentOS, and other enterprise Linux distributions.

Currently, bazelisk releases include `bazelisk-amd64.deb` and `bazelisk-arm64.deb`, but users on RPM-based systems need to manually download and install the raw binaries. Providing official RPM artifacts would streamline installation and updates in these environments.

Compare the existing bazelisk-amd64.deb and bazelisk-arm64.deb release artifacts and trace how those artifacts are published. Identify the release entry point responsible for packaging, then verify that equivalent RPM artifacts are produced for the supported architectures and appear in releases.

Written by the indexing model from the issue text.