If you're not a member of the Docker Registry Hub (https://hub.docker.com), now is the time to register so that you can publish your images on the public Docker repository, which can be accessed from anywhere.
When you add a repository, you should choose the Automated Build option so that you can fetch code from GitHub (or Bitbucket), as shown in the following screenshot:
We'll connect with our GitHub account and select the repository we just created and pushed to
We will start to add our WordPress image, so let's set the repository name to
wordpress on the next screen. ...