refactor file structure

hosts/freun.dev/workout-tracker.nix

@@ -0,0 +1,39 @@
+{ pkgs, ... }:
+let
+  fqdn = "fit.freun.dev";
+  port = 3322;
+  version = "2.0.3";
+in
+{
+  services.workout-tracker = {
+    enable = true;
+    inherit port;
+    package = pkgs.stdenv.mkDerivation {
+      name = "workout-tracker";
+      src = pkgs.fetchurl {
+        url = "https://github.com/jovandeginste/workout-tracker/releases/download/v${version}/workout-tracker-v${version}-linux-amd64.tar.gz";
+        hash = "sha256-kcchO+7HQwmpYRXqrTtyHWDqy7DkKugO+PJRucboycE=";
+      };
+      nativeBuildInputs = [
+        pkgs.autoPatchelfHook
+      ];
+      sourceRoot = ".";
+      installPhase = ''
+        runHook preInstall
+        install -m755 -D workout-tracker $out/bin/workout-tracker
+        runHook postInstall
+      '';
+      meta = with pkgs.lib; {
+        description = "A simple workout tracker";
+        license = licenses.mit;
+        mainProgram = "workout-tracker";
+      };
+    };
+  };
+
+  services.caddy.virtualHosts = {
+    "${fqdn}".extraConfig = ''
+      reverse_proxy localhost:${toString port}
+    '';
+  };
+}