2022
https://piotrminkowski.com/2022/08/02/a-deep-dive-into-spring-boot-configuration/
    !!! incl k8s
2020
https://spring.io/blog/2020/08/14/config-file-processing-in-spring-boot-2-4
    https://stackoverflow.com/questions/64907675/including-profiles-in-spring-boot-2-4-0-version
    ! on-activate
https://spring.io/blog/2020/04/23/spring-tips-configuration
    https://www.youtube.com/watch?v=PsNNGuLi0ns
2019
https://reflectoring.io/spring-boot-configuration-properties/
    https://github.com/thombergs/code-examples/tree/master/spring-boot/configuration
http://dolszewski.com/spring/spring-boot-application-properties-file/