use woodpecker registry

.woodpecker.yml

@@ -11,14 +11,9 @@ steps:
   - name: build
     image: gcr.io/kaniko-project/executor:debug
     commands:
-      - echo "{\"auths\":{\"https://index.docker.io/v1/\":{\"auth\":\"$(echo -n $DOCKER_USERNAME:$DOCKER_PASSWORD | base64)\"}}}" > /kaniko/.docker/config.json
       - /kaniko/executor --context=dir:///woodpecker/src --dockerfile=Dockerfile --destination=scottyah/blog:latest --cache=true
     environment:
       DOCKER_CONFIG: /kaniko/.docker
-      DOCKER_USERNAME:
-        from_secret: docker_username
-      DOCKER_PASSWORD:
-        from_secret: docker_password
 
   # - name: build
   #   image: docker:dind