It is not mandatory to store all your configuration in a single file (master.conf). You can sort values by using different configuration files. In this case, you have to choose a master file which includes other files.
By convention, master.conf is the master file. Following this convention prevents you from specifying it in your karma profile
An included file can include other files. However it’s recommended to list all included files in master file only.
Syntax is :
[includes] file1.conf relative/path/to/file2.conf file3.conf
All paths are relative to configuration root directory (by convention env/)