CI: Run clang format on linux and osx CI and fail if changes are made

CI/check-format.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+dirty=$(git ls-files --modified)
+
+set +x
+if [[ $dirty ]]; then
+	echo "================================="
+    echo "Files were not formatted properly"
+    echo "$dirty"
+    echo "================================="
+    exit 1
+fi