setup railway deploy (#388)

Co-authored-by: Copilot <[email protected]>

Author: nikgraf

.github/workflows/fly-deploy.yml

@@ -0,0 +1,19 @@
+name: Railway Deploy
+on:
+  push:
+    branches:
+      - main
+jobs:
+  deploy:
+    name: Deploy Sync Server
+    runs-on: ubuntu-latest
+    concurrency: deploy-group # optional: ensure only one action runs at a time
+    container: ghcr.io/railwayapp/cli:latest
+    env:
+      SVC_ID: ${{ vars.RAILWAY_SERVICE_ID_PRODUCTION_TESTNET }}
+      RAILWAY_TOKEN: ${{ secrets.RAILWAY_TOKEN_PRODUCTION_TESTNET }}
+    steps:
+      - uses: actions/checkout@v4
+      # Update the cache mount ID in the Dockerfile to include the service-specific pnpm store
+      - run: sed -i 's|\(--mount=type=cache,id=\)workspace|\1${{ env.SVC_ID }}-pnpm-store|' Dockerfile
+      - run: railway up --service=${{ env.SVC_ID }}