builder-source-archive: Explicitly commit with no-gpg-sign

Fixes #439

It does not make much sense trying to commit inside the state dir with
gpg signing enabled. It should be as non interactive as possible
otherwise, it will just hang

Author: bbhtt

src/builder-source-archive.c

@@ -703,7 +703,7 @@ init_git (GFile   *dir,
   basename = g_file_get_basename (dir);
   if (!git (dir, error, "init", NULL) ||
       !git (dir, error, "add", "--ignore-errors", ".", NULL) ||
-      !git (dir, error, "commit", "-m", basename, NULL))
+      !git (dir, error, "commit", "--no-gpg-sign", "-m", basename, NULL))
     {
       g_free (basename);
       return FALSE;