fixes go build on windows (SAP#4858)

* fixes `go build` on windows

cmd/cnbBuild.go

@@ -6,7 +6,6 @@ import (
 	"os"
 	"path"
 	"path/filepath"
-	"syscall"
 
 	"github.com/SAP/jenkins-library/pkg/buildpacks"
 	"github.com/SAP/jenkins-library/pkg/buildsettings"
@@ -21,7 +20,6 @@ import (
 	"github.com/SAP/jenkins-library/pkg/log"
 	"github.com/SAP/jenkins-library/pkg/piperutils"
 	"github.com/SAP/jenkins-library/pkg/syft"
-
 	"github.com/SAP/jenkins-library/pkg/telemetry"
 	"github.com/imdario/mergo"
 	"github.com/mitchellh/mapstructure"
@@ -585,13 +583,7 @@ func runCnbBuild(config *cnbBuildOptions, telemetry *buildpacks.Telemetry, image
 	}
 
 	creatorArgs = append(creatorArgs, fmt.Sprintf("%s:%s", containerImage, targetImage.ContainerImageTag))
-	attr := &syscall.SysProcAttr{
-		Credential: &syscall.Credential{
-			Uid:         uint32(uid),
-			Gid:         uint32(gid),
-			NoSetGroups: true,
-		},
-	}
+	attr := getSysProcAttr(uid, gid)
 
 	err = utils.RunExecutableWithAttrs(creatorPath, attr, creatorArgs...)
 	if err != nil {

cmd/cnbBuildAttr.go

@@ -0,0 +1,17 @@
+//go:build !windows
+
+package cmd
+
+import (
+	"syscall"
+)
+
+func getSysProcAttr(uid int, gid int) *syscall.SysProcAttr {
+	return &syscall.SysProcAttr{
+		Credential: &syscall.Credential{
+			Uid:         uint32(uid),
+			Gid:         uint32(gid),
+			NoSetGroups: true,
+		},
+	}
+}

cmd/cnbBuildAttr_windows.go

@@ -0,0 +1,11 @@
+//go:build windows
+
+package cmd
+
+import (
+	"syscall"
+)
+
+func getSysProcAttr(_ int, _ int) *syscall.SysProcAttr {
+	return &syscall.SysProcAttr{}
+}