Add support for Linux ARM64 (#19931)

#1845

Co-authored-by: Lucas Manuel Rodriguez <lucas@fleetdm.com>
Co-authored-by: Roberto Dip <rroperzh@gmail.com>

cmd/fleetctl/package.go

@@ -38,6 +38,12 @@ func packageCommand() *cli.Command {
 				Usage:    "Type of package to build",
 				Required: true,
 			},
+			&cli.StringFlag{
+				Name:        "arch",
+				Usage:       "Target CPU Architecture for the installer package (Only supported with '--type' deb or rpm)",
+				Destination: &opt.Architecture,
+				Value:       "amd64",
+			},
 			&cli.StringFlag{
 				Name:        "enroll-secret",
 				Usage:       "Enroll secret for authenticating to Fleet server",
@@ -331,6 +337,20 @@ func packageCommand() *cli.Command {
 				return errors.New("--use-system-configuration is only available for pkg installers")
 			}
 
+			linuxPackage := false
+			switch c.String("type") {
+			case "deb", "rpm":
+				linuxPackage = true
+			}
+
+			if opt.Architecture != packaging.ArchAmd64 && !linuxPackage {
+				return fmt.Errorf("can't use '--arch' with '--type %s'", c.String("type"))
+			}
+
+			if opt.Architecture != packaging.ArchAmd64 && opt.Architecture != packaging.ArchArm64 {
+				return errors.New("arch must be one of ('amd64', 'arm64')")
+			}
+
 			var buildFunc func(packaging.Options) (string, error)
 			switch c.String("type") {
 			case "pkg":