Merge branch 'nagyv-agent-getting-started-flux-cli' into 'master'

Use the Flux CLI instead of a large YAML

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/180828



Merged-by: Zachary Painter <zpainter@gitlab.com>
Reviewed-by: Viktor Nagy (GitLab) <vnagy@gitlab.com>
Reviewed-by: Zachary Painter <zpainter@gitlab.com>
Co-authored-by: Viktor Nagy (GitLab) <vnagy@gitlab.com>