Move ref to test

Author: lloeki

.gitlab/prepare-oci-package.sh

@@ -14,7 +14,7 @@ fi
 ## Obtain injector source
 
 injector_repo="https://github.com/DataDog/datadog-injector-rb.git"
-injector_ref="lloeki/injector" # TODO: pin to an injector release
+injector_ref="lloeki/polish" # TODO: pin to an injector release
 injector_path="${HOME}/datadog-injector-rb"
 
 git clone "${injector_repo}" --branch "${injector_ref}" "${injector_path}"