Improve script checking

Current bash/sh checking does not seem to capture many errors, e.g. https://git.code.tecnalia.com/tecnalia_robotics/avanwinglet/avanwinglet_cad_programming/-/commit/de49a6e6c0fc145b9470d7f604481033b9b9b3df

created merge request !51 (merged) to address this issue

mentioned in merge request !51 (merged)

closed with merge request !51 (merged)

mentioned in commit 55b60d38