Drop Codenotary specific environment and secret reference

Author: agners

.github/workflows/builder.yml

@@ -170,8 +170,6 @@ jobs:
             --target /data \
             --cosign \
             --generic ${{ needs.init.outputs.version }}
-        env:
-          CAS_API_KEY: ${{ secrets.CAS_TOKEN }}
 
   version:
     name: Update version