Add flake.nix to enable building with Nix

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

flake.lock

@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1766736597,
+        "narHash": "sha256-BASnpCLodmgiVn0M1MU2Pqyoz0aHwar/0qLkp7CjvSQ=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "f560ccec6b1116b22e6ed15f4c510997d99d5852",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-25.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,27 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+        let
+	  pkgs = import nixpkgs { inherit system; };
+	  joann-pupper-bot = pkgs.crystal.buildCrystalPackage {
+	    pname = "joann-pupper-bot";
+	    version = "0.1.0";
+	    src = ./.;
+            lockFile = ./shard.lock;
+	    shardsFile = ./shards.nix;
+	    format = "shards";
+	    buildInputs = [pkgs.sqlite];
+	  };
+        in
+          {
+            packages = { inherit joann-pupper-bot; };
+            defaultPackage = joann-pupper-bot;
+          }
+    );
+}

shards.nix

@@ -0,0 +1,27 @@
+{
+  "cron_parser" = {
+    url = "https://github.com/kostya/cron_parser.git";
+    rev = "v0.4.0";
+    sha256 = "17fgg2nvyx99v05l10h6cnxfr7swz8yaxhmnk4l47kg2spi8w90a";
+  };
+  "cron_scheduler" = {
+    url = "https://github.com/kostya/cron_scheduler.git";
+    rev = "v0.4.0";
+    sha256 = "0jd0maw1h87hjgjpqhbwxb4yz83g8shlrwfivyf0sd6x3l5lspns";
+  };
+  "db" = {
+    url = "https://github.com/crystal-lang/crystal-db.git";
+    rev = "v0.14.0";
+    sha256 = "1s67fs5abzgg2yyjsm2la967mk881i91h8jdnal072fb9qh9wr58";
+  };
+  "sqlite3" = {
+    url = "https://github.com/crystal-lang/crystal-sqlite3.git";
+    rev = "v0.22.0";
+    sha256 = "1lc8ixnzjx8nsp96qj9yxmfk7g334id8v87g3h5bwgkhkbx5ghqn";
+  };
+  "telepathy" = {
+    url = "https://dev.danilafe.com/Crystal-Bots/telepathy";
+    rev = "v0.2.0";
+    sha256 = "1zhjlpa31vldgd9f6l1hdfj7a97hlqkxkvxzisfs2zfnvc86aiyc";
+  };
+}