chore: add nix flake configuration

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/claude-agent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -0,0 +1,3 @@
+/target
+/result
+.direnv/

flake.lock

@@ -0,0 +1,134 @@
+{
+  "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1767039857,
+        "narHash": "sha256-vNpUSpF5Nuw8xvDLj2KCwwksIbjua2LZCqhV1LNRDns=",
+        "owner": "NixOS",
+        "repo": "flake-compat",
+        "rev": "5edf11c44bc78a0d334f6334cdaf7d60d732daab",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1775087534,
+        "narHash": "sha256-91qqW8lhL7TLwgQWijoGBbiD4t7/q75KTi8NxjVmSmA=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "3107b77cd68437b9a76194f0f7f9c55f2329ca5b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "git-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "gitignore": "gitignore",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1776796298,
+        "narHash": "sha256-PcRvlWayisPSjd0UcRQbhG8Oqw78AcPE6x872cPRHN8=",
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "rev": "3cfd774b0a530725a077e17354fbdb87ea1c4aad",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "git-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1770073757,
+        "narHash": "sha256-Vy+G+F+3E/Tl+GMNgiHl9Pah2DgShmIUBJXmbiQPHbI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "47472570b1e607482890801aeaf29bfb749884f6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1774748309,
+        "narHash": "sha256-+U7gF3qxzwD5TZuANzZPeJTZRHS29OFQgkQ2kiTJBIQ=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "333c4e0545a6da976206c74db8773a1645b5870a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1777386324,
+        "narHash": "sha256-ItxAnpJ3qffijuQzMv72I9v/yi1nWHr67hqQaVuQV6c=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "a6c2d4f65f850a9fa8977da543f8f9949d4a1527",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "git-hooks": "git-hooks",
+        "nixpkgs": "nixpkgs_2"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    git-hooks.url = "github:cachix/git-hooks.nix";
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      flake-parts,
+      git-hooks,
+      ...
+    }@inputs:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = [
+        "x86_64-linux"
+      ];
+
+      perSystem =
+        {
+          system,
+          ...
+        }:
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+            config.allowUnfree = true;
+          };
+
+          pre-commit-check = git-hooks.lib.${system}.run {
+            src = ./.;
+            hooks = {
+              nixfmt.enable = true;
+              rustfmt.enable = true;
+            };
+          };
+
+          music-agregator = pkgs.rustPlatform.buildRustPackage {
+            pname = "music-agregator";
+            version = "0.1.0";
+            src = ./.;
+            cargoLock.lockFile = ./Cargo.lock;
+          };
+        in
+        {
+          formatter = pkgs.nixfmt-tree;
+
+          packages = {
+            default = music-agregator;
+            inherit music-agregator;
+          };
+
+          checks = {
+            inherit pre-commit-check;
+          };
+
+          devShells.default = pkgs.mkShell {
+            inherit (pre-commit-check) shellHook;
+
+            buildInputs = with pkgs; [
+              pre-commit
+              gitleaks
+              plantuml
+
+              rustc
+              cargo
+              rustfmt
+              clippy
+            ];
+          };
+        };
+    };
+}