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Massively underrated. It's actually used to build the pkg.go.dev website itself.

it does mention it:

there’s just 1 static binary, all I need to do to deploy it is copy the binary. If there are static files I can just embed them in the binary with embed.

It is mentioned now.

Which time golang read file, build time or run time ?

Build time

embed package allows to embed assets directly into the binary, so the files are read once during build time and then you can access them as e.g. a byte slice, a string, or a special FS object that acts like an in-memory file system

Build time. It literally embeeds the file in the binary.