test: disable anaconda-iso C10S test for now

We need to disable the C10S test for now, there is bug in
the C10S kernel that prevents the iso to mount its squashfs.
See also:
- #965
- https://issues.redhat.com/browse/RHEL-97547
- https://issues.redhat.com/browse/RHEL-97487

Author: mvo5

test/testcases.py

@@ -98,7 +98,9 @@ def gen_testcases(what):  # pylint: disable=too-many-return-statements
             # a bit more stable
             # TestCaseFedora(image="anaconda-iso", sign=True),
             TestCaseC9S(image="anaconda-iso"),
-            TestCaseC10S(image="anaconda-iso"),
+            # 2025-06-23: disable because of:
+            # https://github.com/osbuild/bootc-image-builder/issues/965
+            # TestCaseC10S(image="anaconda-iso"),
         ]
     if what == "qemu-cross":
         test_cases = []