Build #160

The branch/tag/commit to build.
Specify the exact release version of jetty to publish. For example 9.1.0.RC0.
For example, in most cases, if the BUILD_TAG used is 'jetty-9.4.11.v20180605', the jetty_release_version would be '9.4.11.v20180605'.
When this is left empty the project is treated as a development build.

This parameter is essentially just the folder name under which the repository will be created.