pre-commit add `chmod 644` manual hook for Markdown (#11651)

diff --git a/.github/workflows/linter.yml b/.github/workflows/linter.yml
index e4c7d7e..6ff9974 100644
--- a/.github/workflows/linter.yml
+++ b/.github/workflows/linter.yml
@@ -45,3 +45,5 @@
           key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
       - name: Run pre-commit
         run: pre-commit run --all-files
+      - name: Run manual pre-commit hooks
+        run: pre-commit run --all-files --hook-stage manual
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index edb4d4e..e1a7db7 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -117,6 +117,14 @@
         args: [--config=.github/linters/.markdown-lint.yml]
         types: [markdown]
         files: \.(md|mdown|markdown)$
+  - repo: https://github.com/Lucas-C/pre-commit-hooks
+    rev: v1.5.5
+    hooks:
+      - id: chmod
+        name: set file permissions
+        args: ['644']
+        files: \.md$
+        stages: [manual]
   - repo: https://github.com/adrienverge/yamllint
     rev: v1.37.1
     hooks: