feat: multi-os testing

Author: tylercchase

.github/workflows/e2etest.yml

@@ -9,7 +9,7 @@ permissions:
 jobs:
   test:
     timeout-minutes: 60
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     container:
       image: mcr.microsoft.com/playwright:v1.59.1-noble
       options: --user 1001
@@ -22,6 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         shardIndex: [1, 2, 3, 4]
+        os: [ubuntu-latest, windows-latest, macos-latest]
         shardTotal: [4]
     steps:
       - uses: actions/checkout@v6