feat(nix): add a basic Nix environment (#918)

Co-authored-by: Orhun Parmaksız <[email protected]>

Author: blackheaven

.envrc

@@ -0,0 +1,2 @@
+use flake
+dotenv_if_exists .env

.gitignore

@@ -5,3 +5,10 @@
 **/*.rs.bk
 
 *.flamegraph.svg
+
+# direnv
+/.direnv/
+
+# Potential Nix stuff
+/result
+/result-*

flake.lock

@@ -0,0 +1,36 @@
+{
+  description = "git-cliff";
+
+  inputs = {
+    nixpkgs.url =
+      "github:nixos/nixpkgs/nixos-unstable"; # We want to use packages from the binary cache
+    flake-utils.url = "github:numtide/flake-utils";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = inputs@{ self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ inputs.rust-overlay.overlays.rust-overlay ];
+        };
+      in {
+        devShell = pkgs.mkShell {
+          CARGO_INSTALL_ROOT = "${toString ./.}/.cargo";
+
+          buildInputs = with pkgs; [
+            pkg-config
+            openssl
+            cargo-binutils
+            cargo-watch
+            lld
+            (rust-bin.fromRustupToolchain {
+              channel = "stable";
+              components =
+                [ "rust-analyzer" "rust-src" "rustfmt" "rustc" "cargo" "clippy" ];
+            })
+          ];
+        };
+      });
+}