add permissions to read github oidc token

.github/workflows/dockerhub.yaml

@@ -7,6 +7,9 @@ on:
         # This job can take a while, and we have usage limits, so just publish develop only twice a day
         - cron: "0 7/12 * * *"
 concurrency: ${{ github.workflow }}-${{ github.ref_name }}
+
+permissions:
+  id-token: write # needed for signing the images with GitHub OIDC Token
 jobs:
     buildx:
         name: Docker Buildx