chore: make it easier to pin Rust versions in CI #4448
Merged
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When backporting patches to LTS branches, we often run into CI failures due to changes in rust. Newer rust versions add more lints, which break CI. We really don't want to also have to backport patches that fix CI, so instead, LTS branches should pin the stable rust version in CI (e.g. #4434).
This PR restructures the CI config files to make it a bit easier to set a specific rust version in CI.