Fix Woodpecker CI configuration format

.woodpecker.yml

@@ -1,5 +1,5 @@
-pipeline:
-  build:
+steps:
+  - name: build
     image: woodpeckerci/plugin-docker-buildx
     settings:
       repo: registry.example.com/ploughshares
@@ -17,7 +17,7 @@ pipeline:
       event: [push, tag]
       branch: [main, master]
 
-  deploy:
+  - name: deploy
     image: appleboy/drone-ssh
     settings:
       host: 
@@ -34,7 +34,7 @@ pipeline:
       event: [push, tag]
       branch: [main, master]
 
-  notify:
+  - name: notify
     image: plugins/slack
     settings:
       webhook: