Clean and break pipeline to test

.github/workflows/github-opengjk-examples.yml

@@ -30,6 +30,4 @@ jobs:
     steps:
       - name: Check out repository code
         uses: actions/checkout@v3
-      - run: ls
-      - run: octave --version
       - run: cd examples/matlab/; octave runme.m

examples/matlab/main.m

@@ -61,4 +61,6 @@ if(exist('OCTAVE_VERSION', 'builtin') == 0)
        view(42,21)
        % ... add light
        light('Position',[5 -10 20],'Style','local'); 
-end
+end
+
+error("DOnnnnnt do it again!")