compose: add ability to change the JVB colibri REST API exposed port

Closes: #1250

docker-compose.yml

@@ -277,7 +277,7 @@ services:
         restart: ${RESTART_POLICY}
         ports:
             - '${JVB_PORT:-10000}:${JVB_PORT:-10000}/udp'
-            - '127.0.0.1:8080:8080'
+            - '127.0.0.1:${JVB_COLIBRI_PORT:-8080}:8080'
         volumes:
             - ${CONFIG}/jvb:/config:Z
         environment: