feat(bot): add subscribe/unsubscribe commands and bot bootstrap

bot/Dockerfile

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+FROM python:3.11-slim
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+COPY chorus_bot ./chorus_bot
+CMD ["python", "-m", "chorus_bot.main"]

bot/chorus_bot/cogs/subscribe.py

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+import discord
+from discord import app_commands
+from discord.ext import commands
+
+
+class SubscribeCog(commands.Cog):
+    def __init__(self, bot: commands.Bot, config):
+        self.bot = bot
+        self.config = config
+
+    @app_commands.command(name="subscribe", description="Get pinged when new items land in #inbox")
+    async def subscribe(self, interaction: discord.Interaction):
+        role = interaction.guild.get_role(self.config.triage_role_id)
+        await interaction.user.add_roles(role)
+        await interaction.response.send_message(
+            "You're subscribed to Chorus inbox pings.", ephemeral=True
+        )
+
+    @app_commands.command(name="unsubscribe", description="Stop getting pinged for new items")
+    async def unsubscribe(self, interaction: discord.Interaction):
+        role = interaction.guild.get_role(self.config.triage_role_id)
+        await interaction.user.remove_roles(role)
+        await interaction.response.send_message(
+            "You're unsubscribed from Chorus inbox pings.", ephemeral=True
+        )
+
+
+async def setup(bot: commands.Bot, config):
+    await bot.add_cog(SubscribeCog(bot, config))

bot/chorus_bot/main.py

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+import asyncio
+import discord
+from discord.ext import commands
+from chorus_bot.config import load_config
+from chorus_bot.backend_client import BackendClient
+from chorus_bot.cogs.manual_share import setup as setup_manual_share
+from chorus_bot.cogs.email_ingest import setup as setup_email_ingest
+from chorus_bot.cogs.thread_ingest import setup as setup_thread_ingest
+from chorus_bot.cogs.subscribe import setup as setup_subscribe
+
+
+def build_bot() -> commands.Bot:
+    intents = discord.Intents.default()
+    intents.message_content = True
+    intents.members = True
+    return commands.Bot(command_prefix="!", intents=intents)
+
+
+async def main():
+    config = load_config()
+    bot = build_bot()
+    backend_client = BackendClient(config.backend_base_url)
+
+    @bot.event
+    async def on_ready():
+        await setup_manual_share(bot, config)
+        await setup_email_ingest(bot, config)
+        await setup_thread_ingest(bot, config, backend_client)
+        await setup_subscribe(bot, config)
+        await bot.tree.sync(guild=discord.Object(id=config.guild_id))
+        print(f"Chorus bot ready as {bot.user}")
+
+    await bot.start(config.discord_token)
+
+
+if __name__ == "__main__":
+    asyncio.run(main())