Use clang-format 15

.github/workflows/ensure-formatting.yaml

@@ -15,4 +15,5 @@ jobs:
       - name: Test formatting for all files
         working-directory: ${{ github.workspace }}
         run: |
+          export CLANG_FORMAT_BIN='clang-format-15'
           ./scripts/check-format.sh

scripts/check-format.sh

@@ -3,4 +3,6 @@
 # Go to repository root
 cd "$(dirname "$0")/.." || exit 2
 
-find ./src ./test -iname '*.h' -o -iname '*.cpp' | xargs clang-format -Werror -ferror-limit=1 --dry-run
+CLANG_FORMAT_BIN="${CLANG_FORMAT_BIN:-clang-format}"
+
+find ./src ./test -iname '*.h' -o -iname '*.cpp' | xargs $CLANG_FORMAT_BIN -Werror -ferror-limit=1 --dry-run