Add Docker support

Dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY . .
+
+EXPOSE 5000
+
+CMD ["node", "broccolini-discord.js"]

docker-compose.yml

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+services:
+  broccolini:
+    build: .
+    image: broccolini-bot
+    container_name: broccolini
+    restart: unless-stopped
+    env_file: .env
+    ports:
+      - "100.114.205.53:8892:5000"
+    healthcheck:
+      test: ["CMD", "wget", "-qO-", "http://localhost:5000/"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 15s