I've created a plain java-maven library which can be used by other projects. In my library, I need to use few variables from env vars like System.getenv("ABC"). The project using this library will define these env vars and I want my library to use them. Project will be containerized i.e. it'll define these envs in its deployment file directly or in config-map. Kindly let me know how that can be done?

PS: If any config reqd, kindly suggest on library side but no change on project side.