flake.nix: make update scripts runnable with nix run

flake.nix

@@ -15,6 +15,31 @@
 
     forAllSystems = f: lib.genAttrs systems (system: f system nixpkgs.legacyPackages.${system});
   in {
+    apps = forAllSystems (system: pkgs: let
+      wrapUpdateScript = name: path: {
+        type = "app";
+        meta.description = "A script to update the ${name} data";
+        program = let
+          drv = pkgs.writeShellApplication {
+            name = "update-${name}";
+            text = lib.readFile path;
+            runtimeInputs = lib.pipe path [
+              lib.readFile
+              (lib.splitString "\n")
+              (x: lib.elemAt x 1)
+              (lib.splitString " ")
+              (lib.drop 4) # "#!nix-shell -i bash -p"
+              (map (dep: pkgs.${dep}))
+            ];
+          };
+        in lib.getExe drv;
+      };
+    in {
+      update-jmdict = wrapUpdateScript "jmdict" ./scripts/update-jmdict.sh;
+      update-kanjidic2 = wrapUpdateScript "kanjidic2" ./scripts/update-kanjidic2.sh;
+      update-radkfile = wrapUpdateScript "radkfile" ./scripts/update-radkfile.sh;
+    });
+
     packages = let
       edrdgMetadata = {
         license = [{