fix: any output of compose was redirected to standard error.

bin/compose-core

@@ -3105,6 +3105,7 @@ launch_docker_compose() {
         sha=$(docker_compose_store "$docker_compose_dir/docker-compose.yml") || return 1
     fi
 
+    {
         {
             {
                 if [ -z "$COMPOSE_DISABLE_DOCKER_COMPOSE_STORE" ]; then
@@ -3126,7 +3127,8 @@ launch_docker_compose() {
                 fi
                 echo "$?" > "$docker_compose_dir/.data/errlvl"
             } | _save stdout
-    } 3>&1 1>&2 2>&3 | _save stderr 3>&1 1>&2 2>&3
+        } 3>&1 1>&2 2>&3 | _save stderr
+    } 3>&1 1>&2 2>&3
     if tail -n 1 "$docker_compose_dir/.data/stderr" | egrep "Service .+ failed to build: Error getting container [0-9a-f]+ from driver devicemapper: (open|Error mounting) /dev/mapper/docker-.*: no such file or directory$" >/dev/null 2>&1; then
         err "Detected bug https://github.com/docker/docker/issues/4036 ... "
         err "Please re-launch your command, or switch from 'devicemapper' driver to 'overlayfs' or 'aufs'."