https://www.youtube.com/watch?v=YudT0nHvkkE
protoc --go_out=. --go_opt=paths=source_relative --go-grpc_out=. --go-grpc_opt=paths=source_relative usermgmt/usermgmt.proto
go run usermgmt_server/usermgmt_server.go
go run usermgmt_client/usermgmt_client.go
docker run --name go-grpc -e POSTGRES_PASSWORD=mysecretpassword -p 5431:5431 -d postgres
docker exec -it go-grpc /bin/bash
su - postgres
psql