Workload clusters

This is similar to bootstrap cluster:

mgmt_name=cluster-bootstrap  # or cluster-mgmt
cluster_name=cluster-workload1

KUBITUS_GITLAB_PASSWORD="$gitops_write_token" \
  kubitus-bootstrap \
    --mgmt "$mgmt_name" \
    --cluster "$cluster_name" \
    --clusters-project-url "$clusters_project_url" \
    --clusters-repo-branch "$gitlab_user-$cluster_name" \
    --author-name "$(git config user.name)" \
    --author-email "$(git config user.email)"