added more clang versions

Author: jermp

.github/workflows/build.yaml

@@ -13,6 +13,8 @@ jobs:
           - { name: gcc, version: 12}
           - { name: gcc, version: 13}
           - { name: gcc, version: 14}
+          - { name: clang, version: 14}
+          - { name: clang, version: 15}
           - { name: clang, version: 16}
           - { name: clang, version: 17}
           - { name: clang, version: 18}