make forks of external repositories in the TPM orga.

[kohlhase]

We have some cases, where we have external repositories for systems (e.g. PRESS for the historic systems). For the active systems there are mostly external repositories, sometimes even on departmental servers.

I would generally like to have a fork in the theoremprover-museum organization and keep that up to date automatically. Then we have a safety measure (KISS) when these repositories go away. There may even be a way to update from other (i.e. non-git) repository types (but this is a longer-term problem we can address when we need to).

[kohlhase]

I think this can be done via webhooks. I know that the ncatlab people do something like this at https://github.com/ncatlab/nlab-content