feat(flake): add nix flake

flake.lock

@@ -0,0 +1,103 @@
+{
+  "nodes": {
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1663915940,
+        "narHash": "sha256-6P/xwD2wi05gb3lliwWyhdtK9vKdt7VcZlKFTerd7Ek=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "3c8bbc1d99e241efa29df54658615d7f8344c01f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "naersk": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1662220400,
+        "narHash": "sha256-9o2OGQqu4xyLZP9K6kNe1pTHnyPz0Wr3raGYnr9AIgY=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "6944160c19cb591eb85bbf9b2f2768a935623ed3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1663905476,
+        "narHash": "sha256-0CSwRKaYravh9v6qSlBpM0gNg0UhKT2lL7Yn6Zbx7UM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e14f9fb57315f0d4abde222364f19f88c77d2b79",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "fenix": "fenix",
+        "flake-utils": "flake-utils",
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1663689031,
+        "narHash": "sha256-ElrhxG+zwTOolSsSYtkyFK7MLZKkDi19LyQ6kExoprk=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "5b49745d009634170493a214364261e36228274b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,56 @@
+{
+  description = "The world's your oyster!";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    naersk = {
+      url = "github:nix-community/naersk";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = {
+    self,
+    fenix,
+    flake-utils,
+    naersk,
+    nixpkgs,
+  }:
+    flake-utils.lib.eachDefaultSystem (
+      system: let
+        pkgs = (import nixpkgs) {
+          inherit system;
+        };
+
+        toolchain = with fenix.packages.${system};
+          combine [
+            stable.toolchain
+            targets.x86_64-unknown-linux-musl.stable.rust-std
+          ];
+
+        naersk' = pkgs.callPackage naersk {
+          cargo = toolchain;
+          rustc = toolchain;
+        };
+      in {
+        defaultPackage = naersk'.buildPackage {
+          name = "oyster";
+          src = ./.;
+        };
+
+        devShell = pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [
+            cargo-insta
+            toolchain
+          ];
+        };
+      }
+    );
+}