Create CI/CD test runner

[Tbusk]

Closes #507

This PR addresses the following:

• Adds in missing commas in the existing test
• Adds the test to a test suite for easier runnability
• Adds a workflow which runs all tests that are apart of the test suite using a wildcard
• Fixes the left-over gtk3 init by upgrading it to gtk4 init.

Additional Info

GTK Inits
https://docs.gtk.org/gtk3/func.init.html
https://docs.gtk.org/gtk4/initialization.html

Meson Tests
https://mesonbuild.com/Unit-tests.html

[stsdc]

Thanks @tintou nad @Tbusk! This looks really good!

Do you think it is possible to have any coverage stats?

[Tbusk]

Do you think it is possible to have any coverage stats?

Yes @stsdc - in fact a repo you've worked on looks to have it set up.

lcallarec/live-chart@b0d6481
https://app.codecov.io/gh/lcallarec/live-chart?search=&trend=all%20time&displayType=tree

That approach probably would be the easiest approach.

Meson also seems to have integrations with code coverage, but I haven't had any luck with getting it going due to running into weird errors with paths and permissions.

https://mesonbuild.com/Unit-tests.html

I have been able to run gcovr and lcovr locally as well which meson uses, but haven't found the right configuration to get a usable coverage report yet. Still getting path and permission errors.