Allow concourse to support global secrets

[StevenArmstrong]

A Modest Proposal

Currently concourse only supports secrets scoped to a team or a pipeline as per the documentation
E.g /concourse/main/foo
/concourse/team_a/mypipeline/foo
I have multiple common secrets that sit across multiple teams and I want to minimise the duplication in vault.
It would be helpful if there was a namespace
/concourse/global
This would allow secrets to be shared across teams if they are generic and minimise duplication that could be imported to all teams.

• Concourse version: 4.0.0
• Deployment type (BOSH/Docker/binary): binary
• Infrastructure/IaaS: Iaas
• Browser (if applicable): N/A
• Did this used to work? No

[vito]

sounds like https://github.com/concourse/rfcs/issues/5 is relevant?