fixes distro matching

Adds osrelease to get distro name

config/config.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"fmt"
+	"github.com/cobaugh/osrelease"
 	"github.com/creasty/defaults"
 	"github.com/gbrlsnchs/jwt/v3"
 	"go.uber.org/zap"
@@ -294,7 +295,7 @@ func (c *Configuration) EnsurePterodactylUser() (*user.User, error) {
 
 	// Alpine Linux is the only OS we currently support that doesn't work with the useradd command, so
 	// in those cases we just modify the command a bit to work as expected.
-	if strings.HasPrefix(sysName, "Alpine") {
+	if strings.HasPrefix(sysName, "alpine") {
 		command = fmt.Sprintf("adduser -S -D -H -G %[1]s -s /bin/false %[1]s", c.System.Username)
 
 		// We have to create the group first on Alpine, so do that here before continuing on
@@ -413,20 +414,10 @@ func (c *Configuration) WriteToDisk() error {
 
 // Gets the system release name.
 func getSystemName() (string, error) {
-	// alpine doesn't have lsb_release
-	_, err := os.Stat("/etc/alpine-release")
-	if os.IsNotExist(err) {
-		// if the alpine release file doesn't exist. run lsb_release
-		cmd := exec.Command("lsb_release", "-is")
-
-		b, err := cmd.Output()
-		if err != nil {
-			return "", err
-		}
-
-		return string(b), nil
+	// use osrelease to get release version and ID
+	if  release, err := osrelease.Read(); err != nil {
+		return "", err
 	} else {
-		// if the alpine release file does exist return string
-		return "Alpine", err
+		return release["ID"], nil
 	}
 }