Added missing permissions needed to interact with GitHub's OIDC Token endpoint

.github/workflows/upload-assets-to-cdn.yml

@@ -15,6 +15,9 @@ on:
 jobs:
   Upload-assets-to-CDN:
     runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      contents: read
     steps:
       - name: "Checkout repository"
         uses: actions/checkout@v2