Support for properties with dynamic names (e.g. Quarkus' "%dev,test") in Map-based configuration

[jskillin-idt]

I was told to report an issue here as the issue stems from a lack of feature support in smallrye-config:

Given this Quarkus application.yaml file:

"%dev,test":
  quarkus:
    keycloak:
      devservices:
        roles:
          alice: sample_role

...I was expecting Quarkus (and underneath, it sounds like smallrye-config) to understand that the "quarkus" dictionary to belong to both the "dev" and "test" Quarkus profiles, but Quarkus failed to apply this configuration.

Instead, I was forced to break out the config into two duplicate copies:

---
"%dev":
  quarkus:
    keycloak:
      devservices:
        roles:
          alice: sample_role
---
"%test":
  quarkus:
    keycloak:
      devservices:
        roles:
          alice: sample_role

This works as expected if I used a properties formatted file instead, so this is specific to how YAML is interpreted. Update: this is not true. This does not work whenever the configuration terminates in a Map.

[jskillin-idt]

Quarkus-specific reproducer: https://github.com/jskillin-idt/quarkus-devtest-yaml-plus-security

[radcortez]

Additional Quarkus discussion:
https://quarkusio.zulipchat.com/#narrow/stream/187030-users/topic/YAML.20and.20multiple.20profiles