Use DeterminateSystems/update-flake-lock in CI

Signed-off-by: Sora Morimoto <sora@morimoto.io>

.github/workflows/dependency-review.yml

@@ -7,12 +7,9 @@ permissions: read-all
 jobs:
   dependency-review:
     name: Dependency Review
-
     runs-on: ubuntu-latest
-
     steps:
       - name: Checkout tree
         uses: actions/checkout@v4
-
       - name: Dependency Review
         uses: actions/dependency-review-action@v4

.github/workflows/nix.yml

@@ -1,20 +1,10 @@
-name: "Nix"
+name: Nix
 
 on:
-  pull_request:
-  push:
-    branches:
-      - master
+  - push
+  - pull_request
 
-# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#concurrency
-# Concurrent workflows are grouped by the PR or branch that triggered them
-# (github.ref) and the name of the workflow (github.workflow). The
-# 'cancel-in-progress' option then make sure that only one workflow is running
-# at a time. This doesn't prevent new jobs from running, rather it cancels
-# already running jobs before scheduling new jobs.
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name == 'pull_request' || github.sha }}
-  cancel-in-progress: true
+permissions: read-all
 
 jobs:
   tests:

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

@@ -0,0 +1,22 @@
+name: "Nix: update-flake-lock"
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: 0 0 * * 0
+
+jobs:
+  lockfile:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v30
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: DeterminateSystems/update-flake-lock@v24
+        with:
+          pr-title: Update flake.lock
+          pr-labels: |
+            dependencies
+            no changelog