chore(ci): make docker cleanup robust against hangs and log system disk usage

.gitea/workflows/deploy.yml

@@ -43,15 +43,13 @@ jobs:
       - name: 🧹 Maintenance (High Density Cleanup)
         shell: bash
         run: |
-          echo "=== Docker Disk Usage ==="
-          docker system df || true
+          echo "=== System Disk Usage ==="
           df -h || true
           echo "Purging old build layers and dangling images..."
-          docker system prune -a --volumes -f
-          docker builder prune -a -f
-          docker volume prune -f
-          echo "=== Docker Disk Usage After Prune ==="
-          docker system df || true
+          docker builder prune -a -f || true
+          docker image prune -a -f || true
+          docker system prune -f || true
+          echo "=== System Disk Usage After Prune ==="
           df -h || true
 
       - name: Checkout repository