The i18n-helpers are now available as a stand-alone crate:
https://crates.io/crates/mdbook-i18n-helpers.
Because we cache the Rust binaries in our GitHub workflows, I bumped
the cache prefix to ensure we use a clean cache. Otherwise, Cargo
won’t install the new binaries in mdbook-i18n-helpers because it sees
the old ones from this repository.
* Update mdbook to 0.4.28
This version contains https://github.com/rust-lang/mdBook/pull/1986 which will allow us to test the code in each translation.
* Fix formatting in Korean translation
The extra code block made `mdbook test` fail.
* Extract common build steps to composite actions
This allows us to repeat ourselves less across the different jobs.
I also tested using a “reusable workflow” to factor out the common
steps. However, this starts a separate job without a shared
filesystem, which in turn requires us to upload/download artifacts
when we want to use them in several jobs. The artifacts are downloaded
one-by-one and this adds delays and extra steps to all jobs.
* Move Rust cache setup to its own build step
This made it easy to consistently setup the caching of our nested
projects via the “workspacs” config key.
