Install seaweedfs from unstable on compute nodes.

hosts/common/compute-node.nix

@@ -3,6 +3,7 @@
   imports = [
     ./impermanence.nix
     ./nomad.nix
+    ./seaweedfs.nix
     ./sshd.nix
     ./user-ppetru.nix
     ./unattended-encryption.nix

hosts/common/seaweedfs.nix

@@ -0,0 +1,14 @@
+{ pkgs, ... }:
+{
+  environment.persistence."/persist".directories = [
+  ];
+
+  environment.systemPackages = [
+    pkgs.unstable.seaweedfs
+  ];
+
+  networking.firewall = {
+    allowedTCPPorts = [ ];
+    allowedUDPPorts = [ ];
+  };
+}