Change workflow for 'Start Staging'

[partouf]

Relies on old builds set_current command + environment start which don't work anymore.

Should use ce --env staging blue-green deploy ... with probably some parameters to keep the UI interaction quiet.

[TechWizard9999]

Hi @partouf 👋

I'd love to work on this issue as a beginner contributor. It looks like a good opportunity to get familiar with the workflow system.

Could you please confirm if it’s still open for contribution, and if there are any specific things I should keep in mind before getting started?

Thanks!