feat: new templatetag to check if user has role

gas/templatetags/gas_tags.py

@@ -5,6 +5,7 @@ from django import template
 from django.utils.html import mark_safe
 
 from ..sites import site
+from ..models import UserRole
 
 register = template.Library()
 
@@ -59,3 +60,10 @@ def pagination(request, page):
 @register.filter
 def to_json(data):
     return mark_safe(json.dumps(data))
+
+
+@register.filter
+def has_role(user, role):
+    if user.is_superuser:
+        return True
+    return UserRole.objects.filter(role__in=(role, "admins"), user=user).exists()