ci: Add GitHub Pages deployment workflow (#2)

- Adds GitHub Actions workflow for auto-deploy on push to main
- Adds CNAME for docs.meshguard.app custom domain
- Uses pnpm + VitePress build

Author: dbhurley

.github/workflows/deploy.yml

@@ -0,0 +1,52 @@
+name: Deploy Docs to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v2
+        with:
+          version: 8
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'pnpm'
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Build docs
+        run: pnpm build
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/.vitepress/dist
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

docs/public/CNAME

@@ -0,0 +1 @@
+docs.meshguard.app