Check out Sakai source code to local: [email protected]:sakaiproject/sakai.git, then install needed packages:

cd sakai
mvn install

And deploy the app to tomcat folder:

mvn install sakai:deploy -Dmaven.tomcat.home=<absolute url of docker-sakai/tomcat folder>

Then build the container

docker-compose up --build

You can visit http://localhost:8080/portal to see the result (root url won't work).