ci: Daily flake update

.forgejo/workflows/build.yml

@@ -6,6 +6,8 @@ on:
       - 'flake.lock'
       - 'home/programs/nvim/plugins.nix'
       - '.forgejo/workflows/build.yml'
+  schedule:
+    - cron: '20 4 * * *'
 jobs:
   build-amd64-linux:
     runs-on: nix-amd64

.forgejo/workflows/update-flake.yml

@@ -0,0 +1,20 @@
+name: Update Flake
+on:
+  schedule:
+    - cron: '0 4 * * *'
+jobs:
+  update-flake:
+    runs-on: nix-amd64
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: master
+      - run: nix flake update
+      - uses: https://github.com/stefanzweifel/git-auto-commit-action@v5
+        with:
+          commit_message: "[automation] Update flake"
+          commit_user_name: Actions Bot
+          commit_user_email: daniel+actions-bot@kempkens.io
+          commit_author: Actions Bot <daniel+actions-bot@kempkens.io>