feat(contrib/management): add command to create a superuser from env variables

jdav_web/contrib/management/commands/ensuresuperuser.py

@@ -0,0 +1,28 @@
+import os
+from django.contrib.auth import get_user_model
+from django.core.management.base import BaseCommand
+
+class Command(BaseCommand):
+    help = "Creates a super-user non-interactively if it doesn't exist."
+
+    def handle(self, *args, **options):
+        User = get_user_model()
+
+        username = os.environ.get('DJANGO_SUPERUSER_USERNAME', '')
+        password = os.environ.get('DJANGO_SUPERUSER_PASSWORD', '')
+
+        if not username or not password:
+            self.stdout.write(
+                self.style.WARNING('Superuser data was not set. Skipping.')
+            )
+            return
+
+        if not User.objects.filter(username=username).exists():
+            User.objects.create_superuser(username=username, password=password)
+            self.stdout.write(
+                self.style.SUCCESS('Successfully created superuser.')
+            )
+        else:
+            self.stdout.write(
+                self.style.SUCCESS('Superuser with configured username already exists. Skipping.')
+            )