The customer would like to customize the login page of ORIGAM. For example, they would like to add logos of their sponsors on the Origam login page.
How can these customizations to the login page be retained during future upgrades to new releases of Origam ?
Please follow the instructions in the documentation https://origam.com/doc/display/architect/Custom+Login+Page.
Could you write more detail, please? Is it possible custom login page as change background color and links on pictures?
Yes, as written in the documentation, you need to copy the existing page and then you are free to modify it according to your needs. The only thing to do then is to reconfigure the login page in the Startup.cs configuration file.