Default squashfs compression to zstd, already part of grub's EFI image

Signed-off-by: David Cassany <[email protected]>

pkg/constants/constants.go

@@ -19,7 +19,6 @@ package constants
 import (
 	"os"
 	"path/filepath"
-	"runtime"
 )
 
 const (
@@ -245,7 +244,7 @@ func GetMokMngrFilePatterns() []string {
 }
 
 func GetDefaultGrubModules() []string {
-	return []string{"loopback.mod", "squash4.mod", "xzio.mod"}
+	return []string{"loopback.mod", "squash4.mod", "zstd.mod"}
 }
 
 func GetDefaultGrubModulesPatterns() []string {
@@ -266,13 +265,7 @@ func GetDefaultSquashfsOptions() []string {
 }
 
 func GetDefaultSquashfsCompressionOptions() []string {
-	options := []string{"-comp", "xz", "-Xbcj"}
-	// Set the filter based on arch for best compression results
-	if runtime.GOARCH == "arm64" {
-		options = append(options, "arm")
-	} else {
-		options = append(options, "x86")
-	}
+	options := []string{"-comp", "zstd"}
 	return options
 }