refactor: use standard logger instead of logrus

cmd/image-builder/main_test.go

@@ -14,7 +14,6 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -30,11 +29,6 @@ import (
 	"github.com/osbuild/images/pkg/arch"
 )
 
-func init() {
-	// silence logrus by default, it is quite verbose
-	logrus.SetLevel(logrus.WarnLevel)
-}
-
 func TestListImagesNoArguments(t *testing.T) {
 	restore := main.MockNewRepoRegistry(testrepos.New)
 	defer restore()