There is a properties file application-special.yml that I use for launching app locally with spring-boot-maven-plugin. When the file is located in main/resources it is enough to pass special as profile name to the command:
clean spring-boot:run -D spring-boot.run.profiles=special
How to apply this property file when it is located outside the project?
You can provide any number of external property files with spring-boot like this:
mvn spring-boot:run -Dspring-boot.run.arguments="--spring.config.additional-location=file:/directory_path/filename.yml,file:/directory_path/filename2.yml"