Set OS/ARCH when assembling image

pkg/executor/build.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strconv"
 	"time"
 
@@ -565,6 +566,17 @@ func DoBuild(opts *config.KanikoOptions) (v1.Image, error) {
 			return nil, err
 		}
 
+		configFile, err := sourceImage.ConfigFile()
+		if err != nil {
+			return nil, err
+		}
+		configFile.OS = runtime.GOOS
+		configFile.Architecture = runtime.GOARCH
+		sourceImage, err = mutate.ConfigFile(sourceImage, configFile)
+		if err != nil {
+			return nil, err
+		}
+
 		d, err := sourceImage.Digest()
 		if err != nil {
 			return nil, err