Add cspell to Gitea Action

.gitea/workflows/deploy.yaml

@@ -19,6 +19,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
       - name: Install packages
         run: |
           apt-get update
@@ -36,6 +41,9 @@ jobs:
       - name: Verify RSS template diff
         run: ./bin/check-rss-template
 
+      - name: Spellcheck Markdown
+        run: npx -y cspell "content/**/*.md"
+
       - name: Build site
         run: ./bin/build