Is ConfigMappingBuildItem resulting to a Buildtime or Runtime configmapping?

[HerrDerb]

In an extension I want to add a config map conditional during a BuildStep. I found that ConfigMappingBuildItem might do the job. I couldn't find much documentation (there is no javadoc) about it and therefor am unsure if this will behave as build time property or a runtime property.

Defining a ConfigMappingBuildItem does this result in a Buildtime or Runtime configmapping?

[quarkus-bot[bot]]

/cc @radcortez (config)

[HerrDerb]

Oh I just figured that this is not working at all, as no injectable bean is getting created like this