Embed file in Go using one line go generate

main.go

package main

import (
	"encoding/base64"
	"fmt"
)

//go:generate sh -c "(printf 'package main\nvar myfile string=`'; base64 myfile; printf '`') >myfile_generated.go"

func main() {
	contents, _ := base64.StdEncoding.DecodeString(myfile)
	fmt.Println(string(contents))
}

Makefile

build:
  go generate
  go build