Update '.woodpecker/.build.yml'

.woodpecker/.build.yml

@@ -1,4 +1,10 @@
 pipeline:
+    test:
+        image: ubuntu
+        commands:
+            - pwd
+            - ls -al
+
     build_and_publish:
         image: woodpeckerci/plugin-docker-buildx
         secrets: [ dockerhub_user ]
@@ -11,4 +17,5 @@ pipeline:
                 from_secret: DOCKERHUB_TOKEN
             auto_tag: true
         when:
+            branch: master
             event: [push, tag, deployment]