Lint front matter during main linting run

.github/workflows/pr-check-lint_content.yml

@@ -62,6 +62,25 @@ jobs:
       - name: Install all yarn packages
         run: yarn --frozen-lockfile
 
+      - uses: actions/checkout@v3
+        with:
+          repository: mdn/content
+          path: mdn/content
+
+      - name: Setup Node.js environment for mdn/content
+        uses: actions/setup-node@v3
+        with:
+          node-version-file: ".nvmrc"
+          cache: "yarn"
+          cache-dependency-path: mdn/content/yarn.lock
+
+      - name: Install all yarn packages for mdn/content
+        working-directory: ${{ github.workspace }}/mdn/content
+        run: yarn --frozen-lockfile
+        env:
+          # https://github.com/microsoft/vscode-ripgrep#github-api-limit-note
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Lint and format markdown files
         if: ${{ env.DIFF_DOCUMENTS }}
         run: |
@@ -79,6 +98,14 @@ jobs:
           echo "${EOF}" >> $GITHUB_ENV
           echo "MD_LINT_FAILED=${MD_LINT_FAILED}" >> $GITHUB_ENV
 
+          echo "Linting front-matter"
+          FM_LINT_FAILED=false
+          FM_LINT_LOG=$(cd ${{ github.workspace }}/mdn/content && yarn fix:fm --config-file ${{ github.workspace }}/front-matter-config.json --fix true ${files_to_lint} 2>&1) || FM_LINT_FAILED=true
+          echo "FM_LINT_LOG<<${EOF}" >> $GITHUB_ENV
+          echo "${FM_LINT_LOG}" >> $GITHUB_ENV
+          echo "${EOF}" >> $GITHUB_ENV
+          echo "FM_LINT_FAILED=${FM_LINT_FAILED}" >> $GITHUB_ENV
+
           echo "Running Prettier"
           yarn prettier -w ${files_to_lint}