Add docker files

Dockerfile

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+FROM node:22-alpine
+
+WORKDIR /usr/src/app
+
+COPY package*.json ./
+
+COPY . .
+
+RUN cd client && npm i && npm run build:subfolder && cd ..
+
+RUN cd server && npm i && npm run build
+
+CMD [ "node", "dist/server.js" ]

docker-compose.yml

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+version: "3.1"
+
+services:
+  rumor-party-line:
+    container_name: rumor-party-line
+    restart: always
+    build: .
+    ports:
+      - '9000:3000'
+    environment:
+      PORT: '3000'
+      CLIENT_URL: 'https://rumor.orangemayhem.net'
+      MAX_PARTY_LINES: '5'
+      INITIAL_RUMOR: '...nothing has been said, yet.'
+      ENVIRONMENT: 'production'