initrd ssh: back to std key paths

cmd/dkl-local-server/bootv2.go

@@ -71,7 +71,8 @@ func buildInitrd(out io.Writer, ctx *renderContext) (err error) {
 	// ssh keys
 	// XXX do we want a bootstrap-stage key instead of the real host key?
 	for _, format := range []string{"rsa", "dsa", "ecdsa", "ed25519"} {
-		cat.AppendBytes(cfg.FileContent("/etc/ssh/ssh_host_"+format+"_key"), "id_"+format, 0600)
+		keyPath := "/etc/ssh/ssh_host_" + format + "_key"
+		cat.AppendBytes(cfg.FileContent(keyPath), keyPath, 0600)
 	}
 
 	// ssh user CA