Runner updated and eurovote

modules/common.nix

@@ -26,6 +26,9 @@
       # between weekly GC runs.
       min-free = 2147483648;   # 2 GiB
       max-free = 5368709120;   # 5 GiB
+      # Use the external drive for sandbox builds — the default /tmp is a
+      # small RAM-backed tmpfs that fills up during large builds (e.g. wrangler).
+      build-dir = "/mnt/data/nix-build";
     };
     gc = {
       automatic = true;
@@ -37,6 +40,10 @@
   # Allow unfree packages (e.g. cloudflared binary)
   nixpkgs.config.allowUnfree = true;
 
+  systemd.tmpfiles.rules = [
+    "d /mnt/data/nix-build 0755 root root -"
+  ];
+
   # -------------------------------------------------------------------------
   # Boot — set in hardware.nix; this is just a safe default
   # -------------------------------------------------------------------------