Don't trigger ci tests on md changes

Change-Id: Iec3867be19e85f4e5606137994ece4767413a18b
diff --git a/.github/workflows/check-standard.yaml b/.github/workflows/check-standard.yaml
index 5739ed3..4d95490 100644
--- a/.github/workflows/check-standard.yaml
+++ b/.github/workflows/check-standard.yaml
@@ -3,8 +3,12 @@
 on:
   push:
     branches: [main, master]
+    paths-ignore:
+      - '**.md'
   pull_request:
     branches: [main, master]
+    paths-ignore:
+      - '**.md'
 
 name: R-CMD-check