Stop running actions for md changes.

Author: Moderocky

.github/workflows/maven.yml

@@ -1,5 +1,9 @@
 name: Run Tests
-on: push
+on:
+  push:
+    paths-ignore:
+      - '**.md'
+      - '**.yml'
 jobs:
   run_tests:
     runs-on: ubuntu-latest