Fix curl command to support redirect
Original command results in an error:
> curl https://packages.gitlab.com/install/repositories/runner/gitlab-ci-multi-runner/script.deb | sudo bash
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 158 0 158 0 0 244 0 --:--:-- --:--:-- --:--:-- 244
bash: line 1: syntax error near unexpected token `<'
bash: line 1: `<html><body>You are being <a href="https://packages.gitlab.com/install/repositories/runner/gitlab-ci-multi-runner/script.deb.sh">redirected</a>.</body></html>'