chore: add nix runner

.forgejo/workflows/ci.yaml

@@ -2,8 +2,8 @@ on: [push]
 
 jobs:
   test:
-    runs-on: debian-latest
+    runs-on: nix-latest
-    container:
-      image: ghcr.io/nydragon/runner:latest
     steps:
-      - run: nix flake check --verbose
+      - run: nix --experimental-features 'nix-command flakes' profile install nixpkgs#nodejs-slim
+      - uses: actions/checkout@v4
+      - run: nix  --experimental-features 'nix-command flakes' flake check --verbose

hosts/raptus/forgejo/runner.nix

@@ -24,6 +24,7 @@ in
         labels = [
           "debian-latest:docker://node:18-bullseye"
           "ubuntu-latest:docker://node:18-bullseye"
+          "nix-latest:docker://nixos/nix:latest"
         ];
 
         settings = {