Add github action to update flake lock each Monday morning

.github/workflows/update-home-manager-deps-actions.yaml

@@ -0,0 +1,21 @@
+name: update-flake-lock
+on:
+  workflow_dispatch: # allows manual triggering
+  schedule:
+    - cron: '35 06 * * MON' # runs weekly on Monday at 06:45
+
+jobs:
+  lockfile:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v1
+      - name: Update flake.lock
+        uses: DeterminateSystems/update-flake-lock@vX
+        with:
+          git-author-name: 'Anton Frost'
+          git-author-email: '[email protected]'
+          git-committer-name: 'Anton Frost'
+          git-committer-email: '[email protected]'