some examples in ci cannot write output

[krystophny]

e.g. Error: ] Cannot save PNG file 'output/example/fortran/scatter_demo/scatter_basic.png': Cannot open file 'output/example/fortran/scatter_demo/scatter_basic.png': No such file or directory
Error: ] Cannot save PNG file 'output/example/fortran/scatter_demo/scatter_multi.png': Cannot open file 'output/example/fortran/scatter_demo/scatter_multi.png': No such file or directory
Error: ] Cannot save PNG file 'output/example/fortran/scatter_demo/scatter_gaussian.png': Cannot open file 'output/example/fortran/scatter_demo/scatter_gaussian.png': No such file or directory

[krystophny]

CI infrastructure resolved - example output generation working correctly in CI environment