vault_path : The path in vault containing the key .dockerconfigjson.
The secret must follow this convention
{"auths":{"https://index.docker.io/v1/":{"username":"example_username","password":"team:dckr_pat_example","email":"email@example.com","auth":"dGVhbTpkY2tyX3BhdF9leGFtcGxlCg=="}}}
Where dGVhbTpkY2tyX3BhdF9leGFtcGxlCg== is the base64 encoded value of team:dckr_pat_example.