deps: switch from nix-shell to nix flakes (#124)

README.md

@@ -60,7 +60,7 @@ just install-operator
 > Nix users can enter a development shell with all the necessary dependencies by running:
 > 
 > ```sh
-> nix-shell shell.nix
+> nix develop
 > ```
 
 ## Unit Testing

flake.nix

@@ -0,0 +1,66 @@
+{
+  description = "Development environment for the sp1 tendermint light client";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+
+    solc = {
+      url = "github:hellwolf/solc.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    foundry.url = "github:shazow/foundry.nix/main";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = inputs: inputs.flake-utils.lib.eachSystem
+    [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" ]
+    (
+      system:
+      let
+        pkgs = import inputs.nixpkgs {
+          inherit system;
+          overlays = [
+            (import inputs.rust-overlay)
+            inputs.foundry.overlay
+            inputs.solc.overlay
+          ];
+        };
+      in
+      {
+        devShell = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            openssl
+            openssl.dev
+            pkg-config
+            foundry-bin
+            go-ethereum
+            solc_0_8_28
+            (inputs.solc.mkDefault pkgs solc_0_8_28)
+            bun
+            just
+            golangci-lint
+            go
+            jq
+            parallel
+            rust-bin.stable.latest.default
+            protobuf
+            buf
+            protoc-gen-go
+            protoc-gen-go-grpc
+          ];
+
+          NIX_LD_LIBRARY_PATH = with pkgs.buildPackages; lib.makeLibraryPath [
+            stdenv.cc.cc
+          ];
+
+          shellHook = ''
+            if [ -z "$(which cargo-prove)" ]; then
+              echo "SP1 toolchain is not installed. This is recommended to generate risc-v elfs. To install, please follow the instructions at"
+              echo "https://docs.succinct.xyz/getting-started/install.html"
+            fi
+          '';
+        };
+      }
+    );
+}