nix: add devshell

.envrc

@@ -0,0 +1 @@
+use flake .

.gitignore

@@ -2,5 +2,6 @@
 
 # Added by cargo
 
-/target
-/result
+target
+result
+.direnv

flake.nix

@@ -10,5 +10,11 @@
       inherit system inputs;
       pkgs = nixpkgs.legacyPackages.${system};
     });
+    devShells = nixpkgs.lib.attrsets.genAttrs nixpkgs.lib.systems.flakeExposed (system: {
+      default = import ./shell.nix {
+        inherit system inputs;
+        pkgs = nixpkgs.legacyPackages.${system};
+      };
+    });
   };
 }

shell.nix

@@ -0,0 +1,10 @@
+{
+  pkgs,
+  system,
+  inputs,
+}:
+
+pkgs.mkShell {
+  packages = with pkgs; [];
+  inputsFrom = with inputs.self.legacyPackages.${system}; [ backend web native ];
+}