Complied fleetd installer packages available for all platforms on GitHub that allow users to choose options during install

[nonpunctual]

Customer-eponym feedback:

Having to maintain what are effectively development dependencies & resources for building Fleet install packages the way a dev team would is non-optimal for customers who just want to run an installer to enroll a Host.

Fleet install packages have dependencies on Wix, Wine, Docker. Enrolling hosts into known tenants that are cloud-managed should be easier.

Options can be built into the installers for the most critical options.

Problem

Make downloadable fleetd installers available for all platforms

Potential solutions

1. The install could include a sign-in to a specific tenant & not work without a successful log in
2. The installs should be signed with our developer certs to validate the source with posted hashes the way MySQL hosts pacakges
3. Enroll secrets could be issued on-demand with certificate workflows