feat: add is_use_explicitly_granted_by_author flag to Image model

This is the counterpart to the
requires_express_permission_for_publication field of the License model.

program/migrations/0070_image_is_use_explicitly_granted_by_author.py

+# Generated by Django 4.2.2 on 2023-08-30 14:57
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("program", "0069_alter_license_url"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="image",
+            name="is_use_explicitly_granted_by_author",
+            field=models.BooleanField(default=False),
+        ),
+    ]

program/models.py

@@ -130,6 +130,7 @@ class License(models.Model):
 class Image(models.Model):
     alt_text = models.TextField(blank=True, default="")
     credits = models.TextField(blank=True, default="")
+    is_use_explicitly_granted_by_author = models.BooleanField(default=False)
     height = models.PositiveIntegerField(blank=True, null=True)
     image = VersatileImageField(
         blank=True,