Attempt: Hourly tests on ubuntu only

.github/workflows/e2e-tests.yml

@@ -1,7 +1,7 @@
 name: E2E Tests
 on:
   push:
-    branches: [ main ]
+    branches: [ main, pierremtb/adhoc/hourly-tests-on-ubuntu-only ]
   pull_request:
   schedule:
     - cron: 0 * * * *  # hourly
@@ -291,8 +291,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # TODO: enable self-hosted-windows-8-cores once available
-        os: [namespace-profile-ubuntu-8-cores, namespace-profile-macos-8-cores, windows-16-cores]
+        os: 
+          - key: namespace-profile-ubuntu-8-cores
+          - key: namespace-profile-macos-8-cores
+            if: github.event_name != 'schedule'
+          # TODO: enable namespace-profile-windows-8-cores once available
+          - key: windows-16-cores
+            if: github.event_name != 'schedule'
         shardIndex: [1, 2, 3, 4, 5, 6, 7, 8]
         shardTotal: [8]
         # TODO: add ref here for main and latest release tag