Use pre-commit for markdown linting

Author: John McFarlane

.github/workflows/test.yml

@@ -431,18 +431,6 @@ jobs:
           git config --global --add safe.directory $GITHUB_WORKSPACE
           $GITHUB_WORKSPACE/test/scripts/shellcheck
 
-  # Test markdown
-  markdownlint:
-    runs-on: ubuntu-20.04
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: Run markdownlint
-        shell: bash
-        run: |
-          sudo snap install mdl
-          $GITHUB_WORKSPACE/test/scripts/markdownlint
-
   # Test YAML
   yamllint:
     runs-on: ubuntu-20.04

.pre-commit-config.yaml

@@ -5,3 +5,9 @@ repos:
     hooks:
       - id: trailing-whitespace
         exclude: ^(.*).md$
+
+  - repo: https://github.com/markdownlint/markdownlint
+    rev: v0.11.0
+    hooks:
+      - id: markdownlint
+        args: ["--style", "test/scripts/mdl.style"]