Update Woodpecker CI config to match existing working syntax

.woodpecker.yml

@@ -1,26 +1,35 @@
-steps:
-  - name: build
-    image: woodpeckerci/plugin-docker-buildx
+labels:
+  location: manager
+clone:
+  git:
+    image: woodpeckerci/plugin-git
     settings:
-      repo: registry.example.com/ploughshares
-      registry: registry.example.com
-      username:
+      partial: false
+      depth: 1
+when:
+  branch: [main, master]
+steps:
+  build:
+    name: build
+    image: woodpeckerci/plugin-docker-buildx
+    environment:
+      DOCKER_USERNAME:
         from_secret: docker_username
-      password:
+      DOCKER_PASSWORD:
         from_secret: docker_password
-      tags: 
-        - latest
-        - "${CI_COMMIT_TAG##v}"
-        - "${CI_COMMIT_BRANCH}"
-      dockerfile: docker/ploughshares/Dockerfile
-      platforms:
-        - linux/amd64
-        - linux/arm64
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    commands:
+      - echo "$${DOCKER_PASSWORD}" | docker login -u "$${DOCKER_USERNAME}" --password-stdin registry.example.com
+      - docker build -t registry.example.com/ploughshares:latest -t registry.example.com/ploughshares:${CI_COMMIT_BRANCH} -f docker/ploughshares/Dockerfile .
+      - docker push registry.example.com/ploughshares:latest
+      - docker push registry.example.com/ploughshares:${CI_COMMIT_BRANCH}
     when:
       event: [push, tag]
       branch: [main, master]
 
-  - name: deploy
+  deploy:
+    name: deploy
     image: appleboy/drone-ssh
     settings:
       host: 
@@ -37,7 +46,8 @@ steps:
       event: [push, tag]
       branch: [main, master]
 
-  - name: notify
+  notify:
+    name: notify
     image: plugins/slack
     settings:
       webhook: