Update .forgejo/workflows/update.yml

.forgejo/workflows/update.yml

@@ -5,8 +5,8 @@ on:
     - cron: '0 2 * * *'
 jobs:
     lockfile:
-        runs-on: ubuntu-22.04
+        runs-on: docker
+        container.image: nixos/nix
         steps:
-            - uses: https://github.com/DeterminateSystems/nix-installer-action@main
             - uses: actions/checkout@v4
-            - uses: https://github.com/DeterminateSystems/update-flake-lock@main
+            - run: 'export PATH=/root/.nix-profile/bin; nix flake update --commit-lock-file --commit-lockfile-summary "flake.lock: Update"; git push'