Install Snap

Summary:
Snap offers packages for Linux. It gains in traction
for userland, and some applications are packaged for
Snap before to make way to distro packages.

Fixes T1566.

Test Plan: Test on Eglide to install Starship

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1566

Differential Revision: https://devcentral.nasqueron.org/D2142