Add bootstraps command variations

[LaurentLesle]

Create only the azure AD application (global admin privilege)

az login --allow-no-subscriptions
org_name=contoso

rover -bootstrap \
  -aad-app-name ${org_name}-platform-landing-zones

Create or Read (if no global admin privilege) and register the details as secret in Github

Will register the secrets to support OIDC connect from Github actions.

az login
org_name=contoso

rover -bootstrap \
  -aad-app-name ${org_name}-platform-landing-zones \
  -gitops-pipelines github

All in one

Create or check the Azure bootstrap app id exist
register the secrets for Github Actions deployment
Set the deployment mode to multi subscriptions

az login
org_name=contoso

rover -bootstrap \
  -aad-app-name ${org_name}-platform-landing-zones \
  -gitops-pipelines github \
  -gitops-number-runners 4 \
  -bootstrap-script '/tf/caf/landingzones/templates/platform/deploy_platform.sh' \
  -playbook '/tf/caf/landingzones/templates/platform/caf_platform_prod_nonprod.yaml' \
  -subscription-deployment-mode multi_subscriptions \
  -sub-management www-guid \
  -sub-connectivity xxx-guid \
  -sub-identity yyy-guid \
  -sub-security zzz-guid

[arnaudlh]

Lgtm