CI: Grant checks write permissions to E2E Test Report. (kubernetes#11862)

Signed-off-by: Seonghyeon Cho <[email protected]>

Author: sh-cho

.github/workflows/junit-reports.yaml

@@ -5,6 +5,10 @@ on:
     workflows: ['CI']                     # runs after CI workflow
     types:
       - completed
+
+permissions:
+  checks: write
+
 jobs:
   report:
     runs-on: ubuntu-latest