fix: s2i build on Windows (#1641)

Make all files executable on Windows s2i build.

Signed-off-by: Matej Vasek <mvasek@redhat.com>

pkg/builders/s2i/builder.go

@@ -11,6 +11,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"runtime"
 	"strings"
 
 	"github.com/docker/docker/api/types"
@@ -253,6 +254,11 @@ func (b *Builder) Build(ctx context.Context, f fn.Function) (err error) {
 			}
 			hdr.Name = p
 
+			if runtime.GOOS == "windows" {
+				// Windows does not have execute permission, we assume that all files are executable.
+				hdr.Mode |= 0111
+			}
+
 			err = tw.WriteHeader(hdr)
 			if err != nil {
 				return fmt.Errorf("cannot write header to thar stream: %w", err)