Updated Markdown actions

Author: rimi-itk

.github/workflows/markdown.yaml

@@ -0,0 +1,29 @@
+# Do not edit this file! Make a pull request on changing
+# github/workflows/markdown.yaml in
+# https://github.com/itk-dev/devops_itkdev-docker if need be.
+
+### ## Markdown
+###
+### Uses [itkdev/markdownlint](https://hub.docker.com/r/itkdev/markdownlint) to
+### link all Markdown files (`**/*.md`) in the project.
+###
+### [markdownlint-cli configuration ### files](https://github.com/igorshubovych/markdownlint-cli?tab=readme-ov-file#configuration),
+### `.markdownlint.jsonc` and `.markdownlintignore` control what is actually linted and how.
+
+name: Markdown
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  markdown-lint:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - run: |
+          docker run --rm --volume "$PWD":/md itkdev/markdownlint '**/*.md'