Reduce web export build disk usage

.gitea/workflows/deploy-web.yml

@@ -24,8 +24,13 @@ jobs:
 
       - name: Reclaim failed build layers
         run: |
+          rm -f "${IMAGE_TAR}"
           docker container prune -f
           docker image prune -f
+          docker image prune -af --filter "until=24h"
+          docker builder prune -af || true
+          docker system df
+          df -h
 
       - name: Build Web game image
         run: |
@@ -42,9 +47,14 @@ jobs:
             ssh -o StrictHostKeyChecking=no hz@"$node" "sudo ctr -n k8s.io images import /tmp/step3-web.tar && rm -f /tmp/step3-web.tar"
           done
 
-      - name: Clean runner image archive
+      - name: Clean runner build artifacts
         if: always()
-        run: rm -f "${IMAGE_TAR}"
+        run: |
+          rm -f "${IMAGE_TAR}"
+          if [ -n "${BUILD_TAG}" ]; then
+            docker image rm "step3-web:${BUILD_TAG}" 2>/dev/null || true
+          fi
+          docker image prune -f
 
       - name: Configure kubeconfig
         env: