Create Markdown Lint actions (#17)

* Create lint_md_changes.yml

from https://github.com/DavidAnson/markdownlint-cli2-action

* Update lint_md_changes.yml

* Create lint_md_all.yml (#18)

* Create lint_md_all.yml

* Update lint_md_all.yml

.github/workflows/lint_md_all.yml

@@ -0,0 +1,15 @@
+name: "Lint Markdown (all)"
+
+on: 
+  workflow_dispatch:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: DavidAnson/markdownlint-cli2-action@v13
+      with:
+        globs: |
+          *.md
+          !test/*.md

.github/workflows/lint_md_changes.yml

@@ -0,0 +1,20 @@
+name: "Lint Markdown (Changes)"
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    - uses: tj-actions/changed-files@v40
+      id: changed-files
+      with:
+        files: '**/*.md'
+        separator: ","
+    - uses: DavidAnson/markdownlint-cli2-action@v13
+      if: steps.changed-files.outputs.any_changed == 'true'
+      with:
+        globs: ${{ steps.changed-files.outputs.all_changed_files }}
+        separator: ","