[CI] Forgejo action to update the lockfile

.forgejo/workflows/update-flake-lock.yaml

@@ -0,0 +1,17 @@
+name: update-flake-lock
+on:
+  schedule:
+    - cron: '19 1 * * 6'
+
+jobs:
+  lockfile:
+    runs-on: nix
+    steps:
+      - uses: actions/checkout@v4
+      - name: Update flake.lock
+        uses: DeterminateSystems/update-flake-lock@main
+        with:
+          pr-title: "Update flake.lock" # Title of PR to be created
+          pr-labels: |                  # Labels to be set on the PR
+            dependencies
+            automated