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Reuse Rust cache across different jobs
By default, the rust-cache action will derive a cache key from the GitHub action job. That is, our translations job uses a different cache from our i18n-helpers job.
This is not useful in our case since all our jobs install roughly the same set of binaries: mdbook, mdbook-svgbob, i18n-helpers. We should therefore use a single cache for all of these jobs.
If we’re wrong, we pay with an increase in compilation time: regardless of what we cache, Cargo will install the right thing when asked.
Hmm, this doesn't work very well: a version of the cache was created without ~/.cargo/bin/mdbook, and now the job that creates this file thinks the cache is up-to-date.
I believe this doesn't work because rust-cache uses filenames for caching instead of looking at the mtime or using a checksum: https://github.com/Swatinem/rust-cache/issues/59.
Luckily, the caches fix themselves after some time as the old ones expire. So I think we can close this for now.