feat: try attestations

Author: filmil

.github/workflows/publish-bcr.yml

@@ -20,7 +20,7 @@ jobs:
     with:
       tag_name: ${{ inputs.tag_name }}
       registry_fork: filmil/bazel-central-registry
-      attest: false
+      attest: true
     permissions:
       contents: write
       id-token: write