Simplify check-links.yaml (markdown-link-check) (#6720)

.github/workflows/check-links.yaml

@@ -1,6 +1,9 @@
 name: Check external href links in the documentation
 
 on:
+  push:
+    paths:
+      - '**.md'
   schedule:
     # Run on the first of each month at 9:00 AM (See https://pubs.opengroup.org/onlinepubs/9699919799/utilities/crontab.html#tag_20_25_07)
     - cron: "0 9 1 * *"
@@ -10,11 +13,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Prepare markdown-link-check
-        run: mkdir docs/ROOT && cp CHANGELOG.md README.md docs/ROOT
       - uses: gaurav-nelson/github-action-markdown-link-check@v1
         with:
           use-quiet-mode: 'yes'
           use-verbose-mode: 'no'
           config-file: 'mlc_config.json'
           folder-path: 'docs/'
+          file-path: './CHANGELOG.md, ./README.md'