Clone repository with go-git using SSH Deploy Key

main.go

package main

import (
	"fmt"
	"log"
	"os"
	"strings"

	"github.com/go-git/go-billy/v5/memfs"
	gogit "github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing"
	"github.com/go-git/go-git/v5/plumbing/transport/ssh"
	"github.com/go-git/go-git/v5/storage/memory"
)

func main() {
	key := strings.Replace(os.Getenv("DEPLOY_KEY"), "\\n", "\n", -1)

	// Username must be "git" for SSH auth to work, not your real username. 
  // See https://github.com/src-d/go-git/issues/637
	publicKey, err := ssh.NewPublicKeys("git", []byte(key), "")
	if err != nil {
		log.Fatalf("creating ssh auth method")
	}

	_, err = gogit.Clone(memory.NewStorage(), memfs.New(), &gogit.CloneOptions{
		Auth:          publicKey,
		URL:           "git@github.com:myuser/myproject.git",
		Progress:      os.Stdout,
		ReferenceName: plumbing.ReferenceName("refs/heads/master"),
		SingleBranch:  true,
	})
  	if err != nil {
		log.Fatal(err)
	}

	fmt.Println("clone success")
}