Add license.key option to CI releaseTest build script (elastic/x-pack-elasticsearch#3973)
Add license.key option to CI releaseTest build script (elastic/x-pack-elasticsearch#3973)

See https://groups.google.com/a/elastic.co/d/msgid/build-elasticsearch/CAN1nV7FC6Fij-oSOmWz9WU47WJsJw_8EmiRx22GiLEtDDRj7Pw%40mail.gmail.com?utm_medium=email&utm_source=footer

Related to https://github.com/elastic/infra/pull/3916

Original commit: elastic/x-pack-elasticsearch@a51ff1be3e032c9d7f989e3e29280c700a09e8ce

strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra