Use sunspear as a substituter

build.sh

@@ -5,6 +5,8 @@ set -x
 nix-build \
     --no-out-link \
     --pure \
+    --builders 'ssh://charlotte@sunspear.vanpetegem.me' \
+    --extra-substituters 'ssh://charlotte@sunspear.vanpetegem.me' \
     "${@}"
 
 exit 0

configurations/nix-store.nix

@@ -11,6 +11,7 @@
       automatic = true;
       dates = [ "hourly" ];
     };
+    trustedUsers = [ "@wheel" ];
   };
 
   nixpkgs.config = import ./nix-store/config.nix;