Distribute Bazelisk in package managers for Linux distros

Installation on macOS and Windows only require one package manager command. However, for Linux, we have to add the binary's directory to our `$PATH`. This is quite cumbersome, and it would be better if we could install Bazelisk via package managers instead.

Start by reviewing Bazelisk’s Linux installation flow and the package-manager options relevant to Linux distributions. The work is done when Bazelisk can be installed through appropriate Linux package managers without manually adding its binary directory to PATH.

Written by the indexing model from the issue text.