feat: add DeleteAvatar mutation

src/gql/schema/mutation.py

@@ -1,5 +1,24 @@
 import graphene
+from graphql import ResolveInfo
+
+from users.models.users import UnikubeUser
+
+class DeleteAvatar(graphene.Mutation):
+    class Arguments:
+        id = graphene.UUID()
+
+    ok = graphene.Boolean()
+
+    @classmethod
+    def mutate(cls, root, info: ResolveInfo, **kwargs):
+        pk = kwargs.get("id")
+        if str(pk) == str(info.context.kcuser.get("uuid")):
+            user = UnikubeUser.objects.get(id=pk)
+            user.avatar_image.delete()
+            return cls(ok=True)
+        return cls(ok=False)
 
 
 class Mutation(graphene.ObjectType):
-    pass
+    delete_avatar = DeleteAvatar.Field()
+