githook: pre-commit: run tests

Author: JPHutchins

.githooks/pre-commit

@@ -46,4 +46,7 @@ EOF
 fi
 
 # If there are whitespace errors, print the offending file names and fail.
-exec git diff-index --check --cached $against --
+exec git diff-index --check --cached $against --
+
+# Configure and run the tests/examples
+exec cmake -B build