Add a nix-based build environment

While experimenting with the repository, I've found that it's hard to
build. The list of dependencies is implicit and it takes time to
actually get the stuff compiled and run properly.

I'm not sure if anyone else would use this, but since we took time
to freeze the dependencies, I'm still submitting the result as a
pull-request, at least so that it can be used as a reference.

flake.nix

@@ -0,0 +1,83 @@
+{
+  description = "Solana state proof";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      revCount = self.revCount or 1;
+      package_version = "0.1.0-${toString revCount}";
+
+      # Systems supported
+      allSystems = [
+        "x86_64-linux" # 64-bit Intel/AMD Linux
+        "aarch64-linux" # 64-bit ARM Linux
+        "x86_64-darwin" # 64-bit Intel macOS
+        "aarch64-darwin" # 64-bit ARM macOS
+      ];
+
+      forAllSystems = f: nixpkgs.lib.genAttrs allSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+      });
+
+
+      make_package = pkgs: with pkgs;
+        let
+          stdenv =  pkgs.llvmPackages_15.stdenv;
+
+          pythonEnv = python3.withPackages (ps: with ps; [ sphinx pydata-sphinx-theme ]);
+        in
+          stdenv.mkDerivation {
+            name = "solana_state_proof";
+            src = self;
+            dontFixCmake = true;
+            env.CXXFLAGS = toString([
+              "-fPIC"
+            ]);
+            env.NIX_CFLAGS_COMPILE = toString([
+              "-Wno-unused-but-set-variable"
+            ]);
+            nativeBuildInputs = [
+              cmake
+              fmt_8
+              protobuf
+              c-ares
+              boost177
+              ragel
+              gnutls
+              lz4
+              pkg-config
+              yaml-cpp
+              lksctp-tools
+              hwloc
+              numactl
+              libxfs
+              libsystemtap
+              linuxPackages.perf
+              gdb
+            ];
+            cmakeFlags = [
+              "-DCMAKE_BUILD_TYPE=Debug"
+              "-DBUILD_SHARED_LIBS=FALSE"
+              "-DBUILD_TESTS=TRUE"
+              "-DBUILD_WITH_NUMA=FALSE"
+              "-DBUILD_WITH_CUDA=FALSE"
+              "-DBUILD_WITH_OPENCL=FALSE"
+              "-DBUILD_WITH_SANITIZE=FALSE"
+              "-DBUILD_WITH_DPDK=FALSE"
+              "-DCRYPTO3_HASH_POSEIDON=FALSE"
+              "-DBUILD_EXAMPLES=TRUE"
+              "-DZK_PLACEHOLDER_PROFILING=TRUE"
+              "-DBLUEPRINT_PLACEHOLDER_PROOF_GEN=True"
+            ];
+          };
+    in
+      {
+        packages = forAllSystems({ pkgs }: {
+          solana_state_proof = make_package pkgs;
+          default = make_package pkgs;
+        });
+      };
+}