feat: Dockerize

Dockerfile

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+FROM python:bullseye
+
+WORKDIR /usr/src/app
+
+COPY server2serverMessageBot.py ./
+
+RUN python3 -m pip install --upgrade pip && \
+  python3 -m pip install --no-cache-dir discord.py
+
+CMD python3 server2serverMessageBot.py

README.md

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+# Server2ServerMessageBot
+
+> Forked from https://github.com/birthdaysmoothie22/Server2ServerMessageBot/
+
+## Environment
+
+Please add env vars as in this example:
+```sh
+BOT_KEY=<discord_bot_key>
+CHANNEL_ID_PAIRS={"sender_channel_id_1" : receiver_channel_id_1, "sender_channel_id_2" : receiver_channel_id_2}
+```
+
+## Docker Compose
+
+It is assumed you are using a recent version of docker compose to build and run this bot:
+
+```sh
+docker compose up -d
+```

docker-compose.yml

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+version: '3'
+services:
+  server2server-bot:
+    build: .
+    container_name: server2server-bot
+    environment:
+      - BOT_KEY
+      - CHANNEL_ID_PAIRS 
+    restart: unless-stopped

server2serverMessageBot.py

@@ -1,10 +1,10 @@
 import discord
 import json
 import os
-from dotenv import load_dotenv
+#from dotenv import load_dotenv
 
 #load environment variables
-load_dotenv()
+#load_dotenv()
 
 BOT_KEY = os.getenv('BOT_KEY')
 CHANNEL_ID_PAIRS = json.loads(os.getenv('CHANNEL_ID_PAIRS'))