feat: dockerfile setup

.dockerignore

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+node_modules
+.git
+dist
+*.log
+.env
+.env.*
+.vscode

Dockerfile

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+# syntax=docker/dockerfile:1
+
+FROM node:22-alpine
+
+WORKDIR /app
+
+# Use the Yarn version pinned via package.json "packageManager" / .yarnrc.yml yarnPath
+RUN corepack enable
+
+# Install dependencies first to maximize layer caching.
+# devDependencies are required at runtime because the app is executed with tsx.
+COPY .yarnrc.yml package.json yarn.lock ./
+COPY .yarn/ ./.yarn/
+RUN yarn install --immutable
+
+# Copy the rest of the source
+COPY . .
+
+# The bot is a long-running gateway process executed directly from TypeScript via tsx.
+# (No build step / no HTTP port.)
+CMD ["yarn", "start"]

railway.json

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+{
+  "$schema": "https://railway.com/railway.schema.json",
+  "build": {
+    "builder": "DOCKERFILE",
+    "dockerfilePath": "Dockerfile"
+  }
+}