`tt` does not see config in root directory

[psergee]

Steps to reproduce:

root@c4b168b6d6a6:/# tt init  
   • Environment config is written to 'tt.yaml'
root@c4b168b6d6a6:/# ./tt create cartridge --name app
   ⨯ tt.yaml not found, you need to create tt environment config with 'tt init' or provide exact config location with --cfg option
root@c4b168b6d6a6:/# ls -l
. . . 
tt.yaml 
. . .