Fix private.yml generation for bosh2 client

Signed-off-by: Valeria Perticara <[email protected]>

Author: suhlig

ci/scripts/configure_final_release_bucket

@@ -152,7 +152,8 @@ function write_private_yaml() {
   cat > "${release_config_dir}/private.yml" <<EOF
 ---
 blobstore:
-  s3:
+  provider: s3
+  options:
     access_key_id: ${access_key_id}
     secret_access_key: ${secret_access_key}
 EOF