The general process to install Camel-JBang is described here
jbang app install camel@apache/camel
If you however like to install camel-jbang from this project build you create an alias to the local entry point.
jbang alias add --name camel -Dcamel.jbang.version=4.12.0-SNAPSHOT ./dsl/camel-jbang/camel-jbang-main/dist/CamelJBang.java jbang camel version Camel JBang version: 4.12.0-SNAPSHOT
Alternatively, you can change the version in CamelJBang.java