https://github.com/bazel-contrib/rules_jvm_external/blob/master/docs/api.md#java_export (and [an example](https://github.com/JohnAZoidberg/j-antplus/pull/8/files)) https://docs.jitpack.io/building/#custom-commands https://docs.jitpack.io/#javadoc-publishing would be very neat for #491 (From https://github.com/jitpack/jitpack.io/issues/3129)