default pull options for container images to None, also adding pull options to awxkit

awx/main/migrations/0128_set_default_pull_to_none.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2.16 on 2021-02-16 20:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('main', '0127_reset_pod_spec_override'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='executionenvironment',
+            name='pull',
+            field=models.CharField(choices=[('always', 'Always pull container before running.'), ('missing', 'No pull option has been selected.'), ('never', 'Never pull container before running.')], default=None, help_text='Pull image before running?', max_length=1024),
+        ),
+    ]

awx/main/models/execution_environments.py

@@ -44,7 +44,7 @@ class ExecutionEnvironment(CommonModel):
     pull = models.CharField(
         max_length=1024,
         choices=PULL_CHOICES,
-        default='missing',
+        default=None,
         help_text=_('Pull image before running?'),
     )