Build linux/riscv64 platform for registry.gitlab.com/gitlab-org/gitlab-runner image
What does this MR do?
It adds linux/riscv64 platform to the gitlab-runner-image container
Why was this MR needed?
To match availability on other platforms. The gitlab-runner binary is also already available for linux/riscv64.
What's the best way to test this MR?
I do not know, it is my first MR to this project. Any pointer are welcome!