To upload a Solr configuration ("sample_techproducts_configs") to ZooKeeper, execute the following command:
(note the usage of "chroot" znode "/solr")

$ ${SOLR_ROOT}/server/scripts/cloud-scripts/zkcli.sh \
-zkhost "localhost:2181/solr" \
-cmd upconfig \
-confname solr_config1 \
-confdir ${SOLR_HOME}/configsets/sample_techproducts_configs/conf

You can verify that the configuration is created in ZooKeeper:

$ ${SOLR_ROOT}/bin/solr zk ls /solr/configs -z "localhost:2181,localhost:2182,localhost:2183"

$ _default
solr_config1

You can notice the configuration "_default" which is, by default, created/uploaded to ZooKeeper when Solr start the first time ("${SOLR_HOME}/configsets/_default").