Revert "Publish to Docker-Hub and Codeberg (#27)"

https://codeberg.org/woodpecker-plugins/plugin-docker-buildx/pulls/27#issuecomment-639378

This reverts commit 97917ac4b9.

.woodpecker.yml

@@ -26,21 +26,13 @@ pipeline:
     image: woodpeckerci/plugin-docker-buildx:1.0
     settings:
       platforms: *platforms
-      repo: woodpeckerci/plugin-docker-buildx,codeberg.org/woodpecker-plugins/docker-buildx
+      repo: woodpeckerci/plugin-docker-buildx
       auto_tag: true
       dockerfile: Dockerfile.multiarch
-      logins:
-        - registry: https://index.docker.io/v1/
-          username:
-            from_secret: docker_username
-          password:
-            from_secret: docker_password
-        - registry: https://codeberg.org
-          username:
-            from_secret: cb_username
-          password:
-            from_secret: cb_password
-
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
     when:
       event: [push, tag, cron]
       branch: main