feat: nix flake definition and derivation

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1755615617,
+        "narHash": "sha256-HMwfAJBdrr8wXAkbGhtcby1zGFvs+StOp19xNsbqdOg=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "20075955deac2583bb12f07151c2df830ef346b4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,54 @@
+{
+  description = "A simple bash script to fetch Firefox addons' IDs, to be used in ExtensionSettings policy.";
+
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+  outputs = {
+    nixpkgs,
+    self,
+    ...
+  }: let
+    systems = [
+      "x86_64-linux"
+      "aarch64-linux"
+      "aarch64-darwin"
+    ];
+    forAllSystems = f:
+      nixpkgs.lib.genAttrs systems (system: let
+        pkgs = import nixpkgs {inherit system;};
+      in
+        f {
+          inherit pkgs;
+          inherit (pkgs) lib;
+        });
+  in {
+    overlays = {
+      firefox-prefetch-addons = final: prev: {
+        firefox-prefetch-addons = self.packages.${prev.system}.default;
+      };
+      default = self.overlays.firefox-prefetch-addons;
+    };
+
+    formatter = forAllSystems ({pkgs, ...}: pkgs.alejandra);
+
+    packages = forAllSystems ({
+      lib,
+      pkgs,
+      ...
+    }: {
+      firefox-prefetch-addons = pkgs.writeShellApplication {
+        name = "firefox-prefetch-addons";
+        runtimeInputs = with pkgs; [alejandra jq nix unzip wget];
+        text = builtins.readFile ./firefox-prefetch-addons.sh;
+        excludeShellChecks = ["SC2181"];
+        meta = {
+          description = "A simple bash script to fetch Firefox addons' IDs, to be used in ExtensionSettings policy.";
+          homepage = "https://forge.capytal.company/dot013/firefox-prefetch-addons";
+          license = lib.licenses.wtfpl;
+          maintainers = with lib.maintainers; [guz013];
+        };
+      };
+      default = self.packages.${pkgs.system}.firefox-prefetch-addons;
+    });
+  };
+}