flake.nix: parallelize copying in nomad-job-*

flake.nix

@@ -435,7 +435,7 @@
               for h in server9 server10 ; do
                 echo Sharing with $h
                 ssh root@$h.cluster.zentralwerk.org -- \
-                  bash -e <<EOF
+                  bash -e <<EOF &
                 nix copy --from https://hydra.hq.c3d2.de $JOB
                 mkdir -p /glusterfs/fast/microvms/${name}
                 chown microvm:kvm /glusterfs/fast/microvms/${name}
@@ -445,6 +445,7 @@
                 ln -sfT $JOB /nix/var/nix/gcroots/microvm/${name}
               EOF
               done
+              wait
 
               echo Now starting the job
               ssh root@hydra.serv.zentralwerk.org -- \