replace flake-utils with flake-parts

shell.nix

@@ -1,17 +1,31 @@
-{ mkShellNoCC
-, ssh-to-age
-, sops
-, sops-import-keys-hook
-, deploy-rs
-, nixpkgs-fmt
-}:
+#{ mkShellNoCC
+#, ssh-to-age
+#, sops
+#, sops-import-keys-hook
+#, deploy-rs
+#, nixpkgs-fmt
+#}:
+#
+#mkShellNoCC {
+#  nativeBuildInputs = [
+#    ssh-to-age
+#    sops
+#    sops-import-keys-hook
+#    deploy-rs
+#    nixpkgs-fmt
+#  ];
+#}
 
-mkShellNoCC {
-  nativeBuildInputs = [
-    ssh-to-age
-    sops
-    sops-import-keys-hook
-    deploy-rs
-    nixpkgs-fmt
-  ];
+{
+  perSystem = { inputs', pkgs, ... }: {
+    # Definitions like this are entirely equivalent to the ones
+    # you may have directly in flake.nix.
+    devShells.default = pkgs.mkShellNoCC {
+      nativeBuildInputs = [
+        inputs'.sops-nix.packages.sops-import-keys-hook
+        inputs'.deploy-rs.packages.deploy-rs
+        pkgs.nixpkgs-fmt
+      ];
+    };
+  };
 }