Always save cache (#451)

Always save cache, even if one of the scripts returned an error.

Also use a workflow to clear the cache instead of relying on josStorer/get-current-time@v2.

.github/workflows/clear-cache.yml

@@ -0,0 +1,18 @@
+name: Clear Cache
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * 1' # Every Monday at 00:00 UTC
+
+jobs:
+  clear-cache:
+    name: Clear Cache
+    runs-on: ubuntu-latest
+    steps:
+      - name: Clear all caches
+        run: gh cache delete --all --succeed-on-no-caches
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          OWNER: ${{ github.repository_owner }}
+          REPO: ${{ github.event.repository.name }}