Add "UNATTENDED_MIGRATION" environment variable for automatic migrati…

…on of blocklists

If this environment variable is present and set to true, the bot will automatically run the blocklist migration upon connection and config load, skipping the requirement to run the migration command. This only checks environment variables, it is not a traditional config option.

bot.py

@@ -34,7 +34,7 @@
 except ImportError:
     pass
 
-from core import checks
+from core import checks, migrations
 from core.changelog import Changelog
 from core.clients import ApiClient, MongoDBClient, PluginDatabaseClient
 from core.config import ConfigManager
@@ -576,12 +576,18 @@ async def on_ready(self):
             )
             logger.line()
 
+        # Check if the legacy blocklist is being used
         if len(self.config["blocked"]) > 0 or len(self.config["blocked_roles"]) > 0:
-            logger.warning(
-                "Un-migrated blocklists found. Please run the '[p]migrate blocklist' command after backing "
-                "up your config/database. Blocklist functionality will be disabled until this is done."
-            )
-            logger.line()
+            # This should only run in the host has decided on it, which is why it's environment variable based
+            if "UNATTENDED_MIGRATION" in os.environ.items() and os.environ["UNATTENDED_MIGRATION"].lower() == "true":
+                logger.info("running unattended blocklist migration")
+                await migrations.migrate_blocklist(self)
+            else:
+                logger.warning(
+                    "Un-migrated blocklists found. Please run the '[p]migrate blocklist' command after backing "
+                    "up your config/database. Blocklist functionality will be disabled until this is done."
+                )
+                logger.line()
 
         await self.threads.populate_cache()