Merge pull request #3306 from JohnRTitor/workflows-patch

workflows: add nix workflows

.github/workflows/nix-tests.yml

@@ -0,0 +1,17 @@
+name: "Nix-Tests"
+on:
+  pull_request:
+  push:
+jobs:
+  nix-flake-check:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: cachix/install-nix-action@v27
+      with:
+        extra_nix_config: |
+          experimental-features = nix-command flakes
+          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+    - run: nix flake show
+    - run: nix flake check --print-build-logs
+    - run: nix build --print-build-logs

.github/workflows/nix-update-flake-lock.yml

@@ -0,0 +1,21 @@
+name: update-flake-lock
+on:
+  workflow_dispatch: # allows manual triggering
+  schedule:
+    - cron: '0 0 1 * *' # Run monthly
+  push:
+      paths:
+        - 'flake.nix'
+jobs:
+  lockfile:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: cachix/install-nix-action@v27
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - name: Update flake.lock
+        uses: DeterminateSystems/update-flake-lock@v21