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

CI/before-script-linux.sh

@@ -1,6 +1,11 @@
-#!/bin/sh
-set -ex
+#!/bin/bash
 
+./formatcode.sh
+if ! ./CI/check-format.sh; then
+	exit 1
+fi
+
+set -ex
 ccache -s || echo "CCache is not available."
 mkdir build && cd build
 cmake ..