ci: add check

.gitea/workflows/ci.yaml

@@ -0,0 +1,16 @@
+on:
+  push:
+    branches: 
+      - main
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v25
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+      - run: nix flake check --show-trace --accept-flake-config
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json