🐳 prune docker image cache in gh action

Author: jaka-k

.github/workflows/hetzner-deploy.yml

@@ -24,4 +24,5 @@ jobs:
             cd /home/app/multiagent-rag-system/
             git pull origin master
             docker compose -f docker-compose.prod.yml up -d --build
-            docker builder prune
+            docker builder prune -f
+            docker image prune --force