feat: add Railway deploy workflow and Bun server\n\n- Bun HTTP server listening on PORT\n- start script for Nixpacks\n- GitHub Action for Railway deploy

.github/workflows/railway-deploy.yml

@@ -0,0 +1,36 @@
+name: Deploy to Railway
+
+on:
+  push:
+    branches: [ "main" ]
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: latest
+
+      - name: Install Railway CLI
+        run: npm i -g @railway/cli
+
+      - name: Deploy with Railway
+        env:
+          RAILWAY_TOKEN: ${{ secrets.RAILWAY_TOKEN }}
+          RAILWAY_PROJECT_ID: ${{ secrets.RAILWAY_PROJECT_ID }}
+          RAILWAY_SERVICE_ID: ${{ secrets.RAILWAY_SERVICE_ID }}
+        run: |
+          set -euo pipefail
+          PROJECT_FLAG=""
+          SERVICE_FLAG=""
+          if [ -n "${RAILWAY_PROJECT_ID:-}" ]; then PROJECT_FLAG="--project ${RAILWAY_PROJECT_ID}"; fi
+          if [ -n "${RAILWAY_SERVICE_ID:-}" ]; then SERVICE_FLAG="--service ${RAILWAY_SERVICE_ID}"; fi
+          # Deploy current repo; --yes to skip prompts
+          railway up $PROJECT_FLAG $SERVICE_FLAG --yes
+