basic frontend <=> backend <=> database
https://github.com/tibame201020/k8s_try/blob/main/k8s_yaml
sh database.sh
cd backend
docker build . k8s_backend .
or
sh build-backend_image.sh
cd frontend
docker build . k8s_frontend .
or
sh build-frontend_image.sh
docker compose up
or
docker compose up -d