CI Updates

Until launch, only run tests in CI on Ubuntu (cheaper minutes) and only on PRs.

.github/workflows/test.yaml

@@ -1,17 +1,14 @@
 name: Tests
 
 on:
-  push:
-    branches: ["*"]
+  #push:
+  #  branches: ["main"]
   pull_request:
     branches: ["*"]
 
 jobs:
   build:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [windows-latest, ubuntu-latest]
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4