Rename ruby_docker image to distribution_ci_tools
The ruby_docker
image has grown a lot from having just Ruby and Docker. It now has atleast the following tools
- Ruby
- Rust
- Docker
- jq
- skopeo
- yq
- release-cli
- buildx
- kubectl
- gke-gcloud-auth-plugin
So, it makes sense to rename it to something more generic. In this MR, I am not removing the existing ruby_docker definitions, but rather am adding a new job. The Dockerfile is renamed, and a symlink is created for ruby_docker
image so that we don't have to modify two files. Once we clear all uses of ruby_docker
image, we will drop it.