ci: prune docker cache after CI runs

.gitea/workflows/ci.yaml

@@ -140,8 +140,6 @@ jobs:
             -v /var/www/Gamedata:/var/www/Gamedata \
             epicnext-cms:latest
 
-          docker image prune -f
-
       - name: Health check
         run: |
           for i in $(seq 1 30); do
@@ -162,6 +160,19 @@ jobs:
           docker compose -f /var/www/atom-nexst/docker-compose.yml up -d --no-build 2>&1 || true
           exit 1
 
+      - name: Prune Docker cache
+        if: always()
+        run: |
+          # Ruim de self-hosted runner op zodat de Docker daemon niet
+          # volloopt. Draaiende containers/images (o.a. de net-deployed
+          # epicnext-cms-app) worden nooit geraakt, alleen ongebruikte
+          # images, build-cache, volumes en networks verdwijnen.
+          docker image prune -af || true
+          docker container prune -f || true
+          docker volume prune -f || true
+          docker network prune -f || true
+          docker builder prune -af --keep-storage=2g || true
+
   # ─────────────────────────────────────────────
   # E2E smoke against the freshly deployed container.
   # Runs after a successful deploy on main/master only