If you're fresh out of university, GitHub is useful because it demonstrates relevant non-academic code you've written outside of your studies.
After you've got your first job, I don't care about your GitHub profile unless you've got some impressive stuff on there. As an employer, I care about your ability to work on non-trivial problems in a team, and unless you're contributing to OSS (which few CS grads do) you'll never have this on your "portfolio".
In my experience, your GitHub profile is only noteworthy if you have:
* Breadth of work. Loads of projects in a load of languages that demonstrates you're a tinkerer
* Depth of work. At least one project with 5+ stars that solves a non-trivial problem.
Otherwise, that profile is usually some boilerplate code for a MOOC course or to try a language for the first time, and when hiring that's not an indication of anything.