update flake automatically

Author: mattrobenolt

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

@@ -0,0 +1,38 @@
+name: Update flake lock
+
+on:
+  schedule:
+    - cron: "0 8 * * *"
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v6
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+
+      - name: Update flake.lock
+        run: nix flake update
+
+      - name: Validate flake
+        run: nix flake check
+
+      - name: Commit and push changes
+        run: |
+          if git diff --quiet -- flake.lock; then
+            echo "flake.lock is already up to date"
+            exit 0
+          fi
+
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add flake.lock
+          git commit -m "Update flake.lock"
+          git push