chore(nix): update flake lock & fix devshell+package (#1805)

.gitignore

@@ -40,3 +40,6 @@ PR_DESCRIPTION.md
 IMPLEMENTATION_PLAN.md
 scripts/s3-tests/selected_tests.txt
 docs
+
+# nix stuff
+result*

flake.nix

@@ -76,9 +76,9 @@
 
             buildInputs = with pkgs; [
               openssl
-            ] ++ lib.optionals stdenv.isDarwin [
+            ] ++ pkgs.lib.optionals pkgs.stdenv.isDarwin [
-              darwin.apple_sdk.frameworks.Security
+              pkgs.darwin.apple_sdk.frameworks.Security
-              darwin.apple_sdk.frameworks.SystemConfiguration
+              pkgs.darwin.apple_sdk.frameworks.SystemConfiguration
             ];
 
             cargoBuildFlags = [
@@ -100,5 +100,36 @@
           };
         }
       );
+
+      devShells = forAllSystems (
+        system:
+        let
+          overlays = [ (import rust-overlay) ];
+          pkgs = import nixpkgs { inherit system overlays; };
+          rustToolchain = pkgs.rust-bin.stable.latest.default.override {
+            extensions = [
+              "rust-src"
+              "rust-analyzer"
+              "clippy"
+              "rustfmt"
+            ];
+          };
+        in
+        {
+          default = pkgs.mkShell {
+            packages = [
+              rustToolchain
+              pkgs.pkg-config
+              pkgs.protobuf
+              pkgs.openssl
+            ] ++ pkgs.lib.optionals pkgs.stdenv.isDarwin [
+              pkgs.darwin.apple_sdk.frameworks.Security
+              pkgs.darwin.apple_sdk.frameworks.SystemConfiguration
+            ];
+
+            PROTOC = "${pkgs.protobuf}/bin/protoc";
+          };
+        }
+      );
     };
 }