Worfklow: grant write to id-token permission

Author: max-ipinfo

.github/workflows/cd_rubygems.yaml

@@ -9,6 +9,9 @@ jobs:
   publish:
     runs-on: ubuntu-latest
 
+    permissions:
+      id-token: write
+
     steps:
       - name: Checkout
         uses: actions/checkout@v3