crypto: re-add default self-signed keypair

passbook/crypto/migrations/0002_create_self_signed_kp.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.0.6 on 2020-05-23 23:07
+
+from django.db import migrations
+
+
+def create_self_signed(apps, schema_editor):
+    CertificateKeyPair = apps.get_model("passbook_crypto", "CertificateKeyPair")
+    db_alias = schema_editor.connection.alias
+    from passbook.crypto.builder import CertificateBuilder
+
+    builder = CertificateBuilder()
+    builder.build()
+    CertificateKeyPair.objects.using(db_alias).create(
+        name="passbook Self-signed Certificate",
+        certificate_data=builder.certificate,
+        key_data=builder.private_key,
+    )
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('passbook_crypto', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RunPython(create_self_signed)
+    ]