Add e2e scheduling for 3.2.x branch

Author: jvalkeal

.github/workflows/schedule-e2e.yml

@@ -14,7 +14,7 @@ jobs:
     if: github.repository_owner == 'spring-projects'
     strategy:
       matrix:
-        branch: [ main, 3.1.x ]
+        branch: [ main, 3.2.x, 3.1.x ]
     runs-on: ubuntu-latest
     steps:
     - name: Checkout