Feature Request: multiple default gitpod.yml

[julia-leyton]

Is your feature request related to a problem? Please describe

Enterprise customers having to gitpodify multiple repos that require the exact same or almost exact same config could do it more quickly by having a custom default gitpod.yml available.

Describe the behaviour you'd like

Having a custom set of gitpod.yml files, customers working with a big number of repositories could easily refer to them e.g. with one command when they need to gitpodify a repo. It would increase efficiency gitpodifying at a larger scale.
For them this could be either a template or a base that they could extend from.

Describe alternatives you've considered

Additional context

Signal(s) internal
https://github.com/gitpod-io/customers/issues/48

[stale]

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