chore(docker-compose): fix EDITION var warnings

[TobiaszCudnik]

Because

• warnings on make for EDITION

This commit

• add a default value (empty string)

 !  ~/w/i/vdp   main …  make stop
WARN[0000] The "EDITION" variable is not set. Defaulting to a blank string. 
WARN[0000] The "EDITION" variable is not set. Defaulting to a blank string. 
WARN[0000] The "EDITION" variable is not set. Defaulting to a blank string. 
WARN[0000] The "EDITION" variable is not set. Defaulting to a blank string. 
[+] Stopping 5/5
 ✔ Container pipeline-backend-worker  Stopped                                                                                                                                                                                                                                                                                                                                                                                                                                              0.5s 
 ✔ Container connector-backend        Stopped                                                                                                                                                                                                                                                                                                                                                                                                                                              1.5s 
 ✔ Container controller-vdp           Stopped                                                                                                                                                                                                                                                                                                                                                                                                                                              0.5s 
 ✔ Container pipeline-backend         Stopped                                                                                                                                                                                                                                                                                                                                                                                                                                              2.6s 
 ✔ Container socat                    Stopped                                                                                                                                                                                                                                                                                                                                                                                                                                              0.4s 

[donch1989]

LGTM