add discord bridge field to the channel model

will be used in a future change to clean up markov chains

ircbot/migrations/0019_ircchannel_discord_bridge.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.18 on 2023-02-16 22:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ircbot', '0018_ircserver_replace_irc_control_with_markdown'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='ircchannel',
+            name='discord_bridge',
+            field=models.CharField(blank=True, default='', max_length=32),
+        ),
+    ]