Compile etcd source code

[SingleThread]

I compiled etcd v3.5.4 version by compiling the source code, but the compiled binary has a larger difference in file size than the binary released by etcd. My compilation process is as follows:
export GO111MODULE=on
export GOPROXY=https://mirrors.tools.**/goproxy/
export GONOSUMDB=*
cd /usr1/src/etcd
./build
The size of the etcd binary file differs by 8M. I want to know why It will be so much worse.