GitHub Actions: Build and Push

[RobLoach]

This adds a CI workflow to paq.sh and push the changes to master.

[PavelSharp]

It seems this PR enables automatic building of Nuklear.h. To prevent users from accidentally modifying this generated file, maybe we should consider adding it to .gitignore? In that case, we would need to use git add -f in the workflow to commit it.
To my knowledge, GitHub Actions Workflows run in parallel. This means that ccpp.yml could fail while build-and-push.yml completes successfully.

[RobLoach]

It seems this PR enables automatic building of Nuklear.h. To prevent users from accidentally modifying this generated file, maybe we should consider adding it to .gitignore?

While this seems sound, many people just git clone nuklear, and then refernecee nuklear.h directly. Wouldn't want to break their workflow.

To my knowledge, GitHub Actions Workflows run in parallel. This means that ccpp.yml could fail while build-and-push.yml completes successfully.

Good call. We'll have to make sure this runs after the tests.