Link tasks to their restarts

Closes #1711 (closed)

arkindex/ponos/migrations/0008_task_original_task.py

+# Generated by Django 4.1.7 on 2024-04-23 12:19
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("ponos", "0007_remove_task_has_docker_socket"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="task",
+            name="original_task",
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name="restarts", to="ponos.task"),
+        ),
+    ]