Creating plots as part of a CI/CD pipeline

[CalumSt]

Hi all, using Matplot++ to verify some audio oscillators, filters, and envelopes. As part of the unit testing for these, I want to output plots of a single waveform or frequency response etc, and for the testing to be carried out using GitHub Actions. So, two questions:

1. How can I copy the output jpgs from a build directory to somewhere else for viewing, such that the plots are updated with every merge?
2. How can I set up GNUPlot as part of a build pipeline? I'm guessing I would need to statically link against the binary - but then I'm unsure how to go about this for each OS that I test for?

Any help is appreciated!