Add Gitea Actions deploy workflow

Mirrors the buildfor_life_repair workflow: SSH into LXC, reset working
tree, pull, npm ci, build, db:push, restart the buildfor-life-budget
systemd service, health-check.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -0,0 +1,66 @@
+name: Deploy to LXC
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy via SSH
+        uses: appleboy/ssh-action@v1
+        with:
+          host: ${{ secrets.DEPLOY_HOST }}
+          username: ${{ secrets.DEPLOY_USER }}
+          key: ${{ secrets.DEPLOY_KEY }}
+          port: ${{ secrets.DEPLOY_PORT || 22 }}
+          script: |
+            set -e
+
+            APP_DIR="${{ secrets.DEPLOY_PATH || '/opt/buildfor-life-budget' }}"
+
+            # Set up deploy key for private repo access
+            mkdir -p ~/.ssh
+            echo "${{ secrets.REPO_DEPLOY_KEY }}" > ~/.ssh/repo_deploy_key
+            chmod 600 ~/.ssh/repo_deploy_key
+
+            # Configure SSH to use deploy key for git.b4l.co.th
+            if ! grep -q "git.b4l.co.th" ~/.ssh/config 2>/dev/null; then
+              cat >> ~/.ssh/config <<EOF
+            Host git.b4l.co.th
+              HostName git.b4l.co.th
+              IdentityFile ~/.ssh/repo_deploy_key
+              StrictHostKeyChecking accept-new
+            EOF
+              chmod 600 ~/.ssh/config
+            fi
+
+            # Clone if first deploy, otherwise pull
+            if [ ! -d "$APP_DIR" ]; then
+              echo "==> First deploy, cloning..."
+              git clone git@git.b4l.co.th:B4L/buildfor_life_budget.git "$APP_DIR"
+              cd "$APP_DIR"
+            else
+              cd "$APP_DIR"
+              echo "==> Resetting local changes..."
+              git checkout -- .
+              echo "==> Pulling latest code..."
+              git pull origin main
+            fi
+
+            echo "==> Installing dependencies..."
+            npm ci
+
+            echo "==> Building..."
+            npm run build
+
+            echo "==> Running migrations..."
+            npm run db:push
+
+            echo "==> Restarting service..."
+            sudo systemctl restart buildfor-life-budget
+
+            echo "==> Waiting for startup..."
+            sleep 2
+            systemctl is-active --quiet buildfor-life-budget && echo "Deploy successful!" || (echo "Service failed to start!" && exit 1)