Simplify PR markdown lint workflow and fix deprecation warnings (#553)

Signed-off-by: Martin Morgenstern <[email protected]>

.github/workflows/pr-markdownlint.yml

@@ -6,40 +6,26 @@ on:
       - main
     paths:
       - .nvmrc
+      - package-lock.json
+      - .github/workflows/pr-markdownlint.yml
       - "**/*.md"
 
 jobs:
   lint-docs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
-
-      - name: Get changed files
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          BASE_SHA: ${{ github.event.pull_request.base.sha }}
-          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
-        run: |
-          # Use the GitHub API to get the list of changed files
-          # documenation: https://docs.github.com/rest/commits/commits#compare-two-commits
-          DIFF_DOCUMENTS=$(gh api repos/{owner}/{repo}/compare/${{ env.BASE_SHA }}...${{ env.HEAD_SHA }} \
-            --jq '.files | .[] | select(.status|IN("added", "modified", "renamed", "copied", "changed")) | .filename')
-          # filter out files that are not markdown
-          DIFF_DOCUMENTS=$(echo "${DIFF_DOCUMENTS}" | egrep -i "^files/.*\.md$" | xargs)
-          echo "DIFF_DOCUMENTS=${DIFF_DOCUMENTS}" >> $GITHUB_ENV
+      - uses: actions/checkout@v4
 
       - name: Setup Node.js environment
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version-file: ".nvmrc"
           cache: npm
-          cache-dependency-path:  package-lock.json
-
+          cache-dependency-path: package-lock.json
 
       - name: Install all npm packages
         run: npm ci
 
       - name: Lint markdown files
-        run: |
-          npm run lint:md $DIFF_DOCUMENTS
+        run: npm run lint:md