WILT: Docker + artifactory authentication

Quick one.

• Put this in ~/.docker/config.json to keep it well separate from the git repository itself
• Artifactory provides its own secure password to add to your username.
  1. Log in to Artifactory
  2. Go to Welcome (top right) > Edit Profile > Administration
  3. Grab the Encrypted password contents

• Set the auth bit as per:

  "auths": {
      "<ArtifactoryURL>": {
          "auth": "<base64Encoded(username:encryptedpassword)>"
      }
  },
  

• That should let you log in as you when running docker-compose up --build etc.