sbctl: Implement check for sbctl installation

Signed-off-by: Morten Linderud <morten@linderud.pw>

sbctl.go

@@ -2,6 +2,7 @@ package sbctl
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -199,3 +200,11 @@ func CreateBundle(bundle Bundle) error {
 
 	return nil
 }
+
+// Checks if sbctl is setup on this computer
+func CheckSbctlInstallation(path string) bool {
+	if _, err := os.Stat(path); errors.Is(err, os.ErrNotExist) {
+		return false
+	}
+	return true
+}