Kogito images allow project generation using archetype in case user supplies GIT URL pointing to folder or file with resource files.

However this works just for Quarkus, not for SpringBoot.
For example this CR causes S2I build to fail:

apiVersion: app.kiegroup.org/v1alpha1
kind: KogitoApp
metadata:
  name: example-springboot
spec:
  runtime: springboot
  build:
    gitSource:
      contextDir: dmn-springboot-example/src/main/resources
      uri: https://github.com/kiegroup/kogito-examples

The failure reason is that kogito-quarkus-archetype is used to generate the project even when runtime field in CR specify springboot.
The correct archetype which should be used for springboot runtime is https://github.com/kiegroup/kogito-runtimes/tree/master/archetypes/kogito-springboot-archetype