Add Railway deployment workflow with pinned commit SHAs

.github/workflows/railway.yml

@@ -0,0 +1,18 @@
+name: Railway Deploy
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
+      - uses: actions/setup-node@1e60f620b9541d16bece96c5465dc8ee9832be0b
+        with:
+          node-version: '20'
+      - run: npm install -g @railway/cli
+      - run: railway up --detach
+        env:
+          RAILWAY_TOKEN: ${{ secrets.RAILWAY_TOKEN }}