test nix build

.gitea/workflows/demo.yaml

@@ -5,6 +5,8 @@ on: [push]
 jobs:
   Explore-Gitea-Actions:
     runs-on: ubuntu-latest
+    container:
+      image: lnl7/nix:2.3.16
     steps:
       - run: echo "🎉 The job was automatically triggered by a ${{ gitea.event_name }} event."
       - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by Gitea!"
@@ -13,6 +15,8 @@ jobs:
         uses: actions/checkout@v3
       - run: echo "💡 The ${{ gitea.repository }} repository has been cloned to the runner."
       - run: echo "🖥️ The workflow is now ready to test your code on the runner."
+      - name: Build with Nix
+        run: nix build
       - name: List files in the repository
         run: |
           ls ${{ gitea.workspace }}