Add Gitea Actions workflow for website deployment

Deploys the Astro website to the VPS nginx container via
the runner's mounted host volume on pushes to main.

.gitea/workflows/deploy-website.yml

@@ -0,0 +1,38 @@
+name: Deploy Website
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'website/**'
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install dependencies
+        working-directory: website
+        run: pnpm install
+
+      - name: Build
+        working-directory: website
+        run: pnpm build
+
+      - name: Deploy to host volume
+        run: |
+          rm -rf /home/debian/my-services/cagire-website-data/*
+          cp -r website/dist/* /home/debian/my-services/cagire-website-data/