Add wildcard_dns field

ref #203

src/servala/core/admin.py

@@ -240,7 +240,15 @@ class ControlPlaneAdmin(admin.ModelAdmin):
     fieldsets = (
         (
             None,
-            {"fields": ("name", "description", "cloud_provider", "required_label")},
+            {
+                "fields": (
+                    "name",
+                    "description",
+                    "cloud_provider",
+                    "required_label",
+                    "wildcard_dns",
+                )
+            },
         ),
         (
             _("API Credentials"),

src/servala/core/migrations/0013_controlplane_wildcard_dns.py

@@ -0,0 +1,24 @@
+# Generated by Django 5.2.7 on 2025-10-17 02:51
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0012_serviceoffering_external_links"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="controlplane",
+            name="wildcard_dns",
+            field=models.CharField(
+                blank=True,
+                help_text="Wildcard DNS domain for auto-generating FQDNs (e.g., apps.exoscale-ch-gva-2-prod2.services.servala.com)",
+                max_length=255,
+                null=True,
+                verbose_name="Wildcard DNS",
+            ),
+        ),
+    ]

src/servala/core/models/service.py

@@ -159,6 +159,15 @@ class ControlPlane(ServalaModelMixin, models.Model):
             "Key-value information displayed to users when selecting this control plane"
         ),
     )
+    wildcard_dns = models.CharField(
+        max_length=255,
+        blank=True,
+        null=True,
+        verbose_name=_("Wildcard DNS"),
+        help_text=_(
+            "Wildcard DNS domain for auto-generating FQDNs (e.g., apps.exoscale-ch-gva-2-prod2.services.servala.com)"
+        ),
+    )
 
     class Meta:
         verbose_name = _("Control plane")