Add summary_keys JSONField for the user

bookwyrm/migrations/0121_user_summary_keys.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.5 on 2021-12-22 11:06
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("bookwyrm", "0120_list_embed_key"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="user",
+            name="summary_keys",
+            field=models.JSONField(null=True),
+        ),
+    ]