changed action

.gitea/workflows/nix-check.yaml

@@ -0,0 +1,19 @@
+name: Verify Nix Flake Build
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  verify_build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Nix
+        uses: cachix/install-nix-action@v2
+        with:
+          nix_version: '2.18.1'
+      - name: Verify Nix Flake
+        run: nix flake check