diff --git a/.forgejo/workflows/tests.yml b/.forgejo/workflows/tests.yml
index b207471..5c3b26f 100644
--- a/.forgejo/workflows/tests.yml
+++ b/.forgejo/workflows/tests.yml
@@ -6,6 +6,21 @@ on:
   workflow_dispatch:
 
 jobs:
+  nix:
+    runs-on: docker
+    container:
+      image: nix
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Nix doctor
+        run: nix doctor
+      - name: Check flake
+        run: nix flake check --all-systems
+      - name: Build flake
+        run: nix build --print-out-paths
+      - name: Flake info
+        run: nix flake info
   tests:
     runs-on: docker
     container:
diff --git a/README.md b/README.md
index db01563..4df65b6 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,6 @@
-[![maintained](https://img.shields.io/maintenance/yes/2024)]()
+[![maintained](https://img.shields.io/maintenance/yes/2024?style=flat-square)]()
+![Gitea Release](https://img.shields.io/gitea/v/release/cccb/sanic?gitea_url=https%3A%2F%2Fgit.berlin.ccc.de&sort=semver&display_name=release&style=flat-square)
+
 
 # 🦔 sanic
 
diff --git a/flake.nix b/flake.nix
index 3bbdc4e..d57e6ad 100644
--- a/flake.nix
+++ b/flake.nix
@@ -21,12 +21,14 @@
         src = ./.;
         modules = ./gomod2nix.toml;
       };
-    in {
+    in
+    {
       packages.default = sanic;
+      formatter = pkgs.nixpkgs-fmt;
       devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [
           go
-          go-tools  # staticcheck
+          go-tools # staticcheck
           gomod2nix.packages.${system}.default
           sanic
         ];