test: fix workflow labels to target yogabook

.woodpecker.yml

@@ -1,4 +1,3 @@
-# Test pipeline for yogabook worker verification
 kind: pipeline
 type: docker
 name: yogabook-test
@@ -11,9 +10,14 @@ steps:
   - name: hello-world
     image: alpine:latest
     commands:
-      - echo "=== YOGABOOK WORKER TEST ==="
+      - echo "== YOGABOOK WORKER TEST =="
       - echo "Hello from yogabook!"
       - uname -a
-      - echo "=== TEST COMPLETE ==="
+      - hostname
+      - echo "== TEST COMPLETE =="
     when:
       branch: test-yogabook
+
+workflow:
+  labels:
+    gpu: nvidia940mx