Update on "Add cuda binary + tests"

Tests cuda support for `multipy::runtime` + adds creates a nightly using `cudatoolkit 11.3`. We need this in order to prototype multipy using cuda, however, we will be able to deprecate this once we are able to link dynamically to pytorch.

Differential Revision: [D37758429](https://our.internmc.facebook.com/intern/diff/D37758429)

[ghstack-poisoned]

Author: PaliC

.github/workflows/runtime_nightly.yaml

@@ -3,6 +3,7 @@ name: Multipy runtime nightly release
 on:
   schedule:
     - cron: '0 2 * * *' # run at 2 AM UTC
+  pull_request:
   push:
     branches:
       - main