Running “mvn install” on any repository root will nicely build all artifacts (.jar files). You can upload it here, when you rename .jar into .pdf (after downloading rename it back to .jar). But I didn’t test it yet…
The “standard recommended way” I don’t know, sorry… maybe someone else…
Create a pull request for your binding. Also add the pom.xml of your binding to addons/bindings/pom.xml at the alphabetically correct place.
That way, Jenkins will build your project and upload the jar file to the repository. Then, you can take the link to the repository and give either that link to people or even add an entry for your binding to the IoT marketplace.