Disable Clang 15 build due to broken image

Author: offa

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
           - gcc:10
           - gcc:9
           - clang:16
-          - clang:15
+          # - clang:15 # Disabled due to broken image
           - clang:14
           - clang:13
           - clang:12