Add download URL for executable files (#28260)

Consider executable files as a valid case when returning a DownloadURL for them.
They are just regular files with the difference being the executable permission bit being set.

Co-authored-by: Gusted <postmaster@gusted.xyz>

services/repository/files/content.go

@@ -220,7 +220,7 @@ func GetContents(ctx context.Context, repo *repo_model.Repository, treePath, ref
 		}
 	}
 	// Handle links
-	if entry.IsRegular() || entry.IsLink() {
+	if entry.IsRegular() || entry.IsLink() || entry.IsExecutable() {
 		downloadURL, err := url.Parse(repo.HTMLURL() + "/raw/" + url.PathEscape(string(refType)) + "/" + util.PathEscapeSegments(ref) + "/" + util.PathEscapeSegments(treePath))
 		if err != nil {
 			return nil, err