tests: add test for ref specify

pkg/repos/pull.go

@@ -391,12 +391,17 @@ func (rs *Repos) processRepoChanges(ctx context.Context, repo types.Repo, r *git
 			}
 			scriptFl, err := oldCommit.File(action.File)
 			if err != nil {
-				return nil
+				return fmt.Errorf("error getting file: %w", err)
 			}
 
 			r, err := scriptFl.Reader()
 			if err != nil {
-				return nil
+				return fmt.Errorf("error creating reader: %w", err)
+			}
+
+			runner, err := rs.processRepoChangesRunner(repoDir, filepath.Dir(filepath.Join(repoDir, action.File)))
+			if err != nil {
+				return fmt.Errorf("error creating process repo changes runner: %w", err)
 			}
 
 			var pkg db.Package