Firstly, Build Mysql Docker Image:
docker build -t mysql -f ./Dockerfile.mysql .
Secondly, Build Sakai Docker Image:
docker build --build-arg release=20.5 -t sakai -f ./Dockerfile.sakai .
Then Launch Mysql Container:
docker run -d --name mysql -p 3306:3306 mysql
After Launching Mysql Container, Now Launch Sakai Container linked with Mysql container
docker run -d --name sakai -p 8080:8080 --link mysql:mysql sakai