diff --git a/.gitea/workflows/test-u4-runner.yml b/.gitea/workflows/test-u4-runner.yml
new file mode 100644
index 0000000..aa26f33
--- /dev/null
+++ b/.gitea/workflows/test-u4-runner.yml
@@ -0,0 +1,21 @@
+name: test-u4-runner
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - '.gitea/workflows/test-u4-runner.yml'
+
+jobs:
+  hello:
+    name: u4 runner smoke test
+    runs-on: u4
+    container:
+      image: ubuntu:24.04
+    steps:
+      - name: hostname + uname
+        run: |
+          echo "hostname: $(hostname)"
+          echo "uname: $(uname -a)"
+          echo "ip route: $(ip route | head -3)"
+          echo "test OK"