Add doxygen.sh script to git hooks

Add the doxygen.sh script to the pre-push git script
diff --git a/tests/git-scripts/pre-push.sh b/tests/git-scripts/pre-push.sh
index 7407f44..86edf5a 100755
--- a/tests/git-scripts/pre-push.sh
+++ b/tests/git-scripts/pre-push.sh
@@ -46,3 +46,4 @@
 run_test ./tests/scripts/check-names.sh
 run_test ./tests/scripts/check-generated-files.sh
 run_test ./tests/scripts/check-files.py
+run_test ./tests/scripts/doxygen.sh