Please note this is for a dev setup, not production. On first login you will need to add passwords to the setup - the docker-compose.yaml contains the username/password that you can use.
# in root directory of the unpackaged zip / repository root
docker compose up
# wait about 3 mins until all the files have installed and you see joomla-4-t4 in the logs, then you can access in browser with localhost:80
Database setup should be as per image (you can use auto generated table prefix):
Go to 2. Manual Installation (files are in repo root) https://www.joomlart.com/documentation/t4-framework/installation-instructions
From your back-end setting panel, go to: Extensions → Extension Manager, browse T4 plugin installation file then hit the Upload and Install
Now, drag and drop the T4 System plugin (t4-system-plugin_2.2.1.zip) to install.
In the same window, drag and drop the T4 blank template installation package (tpl_t4_bs5_blank_1.1.6.zip) to install.
Now, go to System > Site Template Styles and set the T4 Blank template as your website default template style.
Click on Filter options, and then Default icon