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Personally I'd like toolchain: msrv as you can already pass words like stable, nightly or beta to it. Then you can specify multiple toolchain versions in the matrix like [stable, beta, msrv] etc.
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actions-rs
Actions? If you think it's a problem related to Github Actions in general, use GitHub Community forum instead: https://github.communityMotivation
Rust 1.56 added the Cargo manifest key
rust-version
to indicate the minimal supported rust version (MSRV).It would be nice to only configure this only in a single location and use it automatically from ci.
Workflow example
The big question is probably how this would be useful as a config.
Adding a special key for this might be easier to understand but is error prone and has many unclear states.
providing a special value to the toolchain value is also not as nice as I would like it to be.