[CI] Forgejo action to update the lockfile

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

@@ -1,8 +1,7 @@
 name: update-flake-lock
 on:
-  workflow_dispatch: # allows manual triggering
   schedule:
-    - cron: '0 0 * * 0' # runs weekly on Sunday at 00:00
+    - cron: '19 1 * * 6'
 
 jobs:
   lockfile: