Configure bors for rust-lang/rust

[Kobzol]

This shouldn't actually change anything, it's just for documentation. The corresponding changes to allow bors to push to automation/bors/auto[-merge] and main/stable/beta have to be done manually by an infra admin.

[rustbot]

rust_team_data/src/v1.rs has been modified, it is used (as a git dependency) by multiple sub-projects like triagebot, the www.rust-lang.org website and others.

If you are changing the data structures, please make sure that the changes are not going to break serde deserialization (adding a field is fine; removing or renaming a field isn't).

If you must do a breaking change to the format, make sure to coordinate it with all the users of the rust_team_data crate.

[github-actions]

Dry-run check results

[WARN  sync_team] sync-team is running in dry mode, no changes will be applied.
[INFO  sync_team] synchronizing crates-io
[INFO  sync_team] synchronizing github
[INFO  sync_team] 💻 Repo Diffs:
    📝 Editing repo 'rust-lang/bors':
      Rulesets:
          Branch protection for main
    📝 Editing repo 'rust-lang/rust':
      Environments:
        🔄 Update: bors
            Adding branches: automation/bors/auto

[marcoieni]

The corresponding changes to allow bors to push to automation/bors/auto[-merge] and main/stable/beta have to be done manually by an infra admin.

done ✅