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document the new blue-green strategy offered by multiapps plugin (#3209)

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* document the new blue-green strategy offered by multiapps plugin

* clarify app-appendix

Co-authored-by: Oliver Nocon <33484802+OliverNocon@users.noreply.github.com>
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documentation/docs/steps/cloudFoundryDeploy.md
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@ -15,6 +15,12 @@ Deployment can be done
* Standard `cf push` and [Bluemix blue-green plugin](https://github.com/bluemixgaragelondon/cf-blue-green-deploy#how-to-use)
* [MTA CF CLI Plugin](https://github.com/cloudfoundry-incubator/multiapps-cli-plugin)
!!! note "Blue-Green Deployment with MTA CF CLI Plugin"
The Multiapps Plugin offers 2 different strategies:
* [Blue-Green Deployment Strategy](https://github.com/SAP-samples/cf-mta-examples/tree/main/blue-green-deploy-strategy) - where the production environments are called “live” and “idle” during deployment. This strategy is activated with `mtaDeployParameters: --strategy blue-green --skip-testing-phase` and `deployType=standard`. After deployment, appnames are not appeneded by any suffix like `-live` or `-idle`.
* [Legacy Blue-Green Deployment](https://github.com/SAP-samples/cf-mta-examples/tree/main/blue-green-deploy-legacy) - where the productive environments are called “blue” and “green. Activated by `deployType=blue-green`. After deployment, appnames are appeneded by suffix like `-blue` or `-green`
!!! note
Due to [an incompatible change](https://github.com/cloudfoundry/cli/issues/1445) in the Cloud Foundry CLI, multiple buildpacks are not supported by this step.
If your `application` contains a list of `buildpacks` instead of a single `buildpack`, this will be automatically re-written by the step when blue-green deployment is used.