Add Gitea Actions workflow for Markdown linting and CI scaffold

.gitea/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  markdown-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '18'
+      - name: Install markdownlint-cli
+        run: npm install -g markdownlint-cli
+      - name: Lint Markdown files
+        run: markdownlint '**/*.md'
+
+  # Scaffold for future build/test jobs
+  # build:
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #     - name: Checkout code
+  #       uses: actions/checkout@v3
+  #     - name: Build (placeholder)
+  #       run: echo "Build step goes here"