cleanup: Remove no longer needed tools workflow

.forgejo/workflows/build-tools.yml

@@ -1,21 +0,0 @@
-
-on:
-  schedule:
-    - cron: 6 6 * * *
-  workflow_dispatch:
-
-jobs:
-  cleanup_podman:
-    runs_on: ubuntu-24.04
-    steps:
-      - run: podman system prune -a -f
-
-  build-node:
-    runs_on: ubuntu-24.04
-    depends_on:
-      - cleanup_podman
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          lfs: true
-      - run: cd images/node/22 && podman build . -t internal__node:22