ci: use shared key for build workflow (#1868)

.github/workflows/core.yml

@@ -160,6 +160,7 @@ jobs:
           # The prefix cache key, this can be changed to start a new cache manually.
           # default: "v0-rust"
           prefix-key: ""
+          shared-key: "core-registry"
           cache-targets: "false"
 
       - name: Setup protoc