fix(middleware): set GIN_MODE to release

Author: gsanchietti

imageroot/systemd/user/nethcti-middleware.service

@@ -40,6 +40,7 @@ ExecStart=/usr/bin/podman run \
     --env=NETHVOICE_MIDDLEWARE_MARIADB_PORT=${NETHVOICE_MARIADB_PORT} \
     --network=host \
     --tz=${TIMEZONE} \
+    --env=GIN_MODE=release \
     ${NETHVOICE_CTI_MIDDLEWARE_IMAGE}
 
 ExecStopPost=/usr/bin/podman rm --ignore -f --cidfile %t/nethcti-middleware.ctr-id