ci: fix syntax in docker-build-model.sh

Author: Oleksandr Dzhychko

docker-build-model.sh

@@ -8,7 +8,7 @@ TAG=$( ./modelix-version.sh )
   cd model-server
   if [ "${CI}" = "true" ]; then
     docker buildx build --platform linux/amd64,linux/arm64 --push \
-    -t modelix/model-server:latest -t "modelix/model-server:${TAG}"
+    -t modelix/model-server:latest -t "modelix/model-server:${TAG}" \
     -t modelix/modelix-model:latest -t "modelix/modelix-model:${TAG}" .
   else
     docker build \