goreleaser/docs/025-version.md

title
main.version

GoReleaser always sets a main.version ldflag. You can use it in your main.go file:

package main

var version = "master"

func main() {
  println(version)
}

version will be set to the current Git tag (the v prefix is stripped) or the name of the snapshot, if you're using the --snapshot flag.

You can override this by changing the ldflags option in the build section.