add gh-actions from highcharter

Change-Id: I5eaa87ea5148fbfccebb9898556e4693361f6c8e
diff --git a/.Rbuildignore b/.Rbuildignore
index 8f7d35b..620d99d 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -3,3 +3,4 @@
 ^Readme.md
 ^cran-comments.md
 ^LICENSE\.md$
+^\.github/workflows$