ci: fix docker build

.woodpecker.yml

@@ -5,14 +5,13 @@ when:
 steps:
   build:
     name: build docker image
-    image: plugins/docker
+    image: woodpeckerci/plugin-docker-buildx
     settings:
+      repo: registry.decapod.one/brethil/dotfiles
       registry: registry.decapod.one
       auto_tag: true
-      repo: registry.decapod.one/brethil/dotfiles
-      dockerfile: Dockerfile
-      tags:
-        - latest
+      dry_run: true
+      # output: type=oci,dest=${CI_REPO_OWNER}-hello.tar
 
   notify:
     image: registry.decapod.one/toolchain:latest