repository authorisations

[hannesm]

this add - in opam file format - authorisations for packages -- based on empirical analysis of the last 7000 PRs - see https://hannes.nqsb.io/Posts/Maintainers for details.

This is required for conex. This should not harm any old opam (famous last words).

[camelus]

✅ No new or changed opam files 887a5f0

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✅ Installability check (6110 → 6110)

[avsm]

hannesm: we need to work out a deployment/maintenance plan for both opam2 and conex before merging this into the stable repo. I'll close this for now as it's running the CI every time, but that's not because it won't get accepted eventually...