test: added gel but haven't tested

packages/tome/default.nix

@@ -0,0 +1,22 @@
+{ inputs, ... }:
+{
+  perSystem =
+    { pkgs, ... }:
+    {
+      devShells.tome = pkgs.mkShell {
+        buildInputs = builtins.attrValues {
+          inherit (inputs.gel.packages."x86_64-linux") gel-cli gel-ls;
+        };
+      };
+
+      packages.tome = pkgs.stdenv.mkDerivation {
+        installPhase = ''
+          mkdir -p $out
+          cp -r dbschema $out/
+          cp gel.toml $out/
+        '';
+        name = "tome";
+        src = ./src;
+      };
+    };
+}