- Rust backcompat removes the need to specify the version here
- Using these commands can result in a needless toolchain getting
downloaded, like in the case where user only has Nightly installed
It seems one can't overwrite a cache entry:
```
Failed to save: Unable to reserve cache with key linkcheck--0.8.1, another job may be creating this cache. More details: Cache already exists. Scope: refs/heads/master, Key: linkcheck--0.8.1, Version: 33f8fd511bed9c91c40778bc5c27cb58425caa894ab50f9c5705d83cb78660e0
Warning: Cache save failed.
```
A proper solution is to use `restore-keys`:
https://github.com/actions/cache/blob/main/tips-and-workarounds.md#update-a-cache
This will cause the CI build to be marked successful even if the build
failed. Instead, use `if: '!cancelled()'` to always save the cache
(except when the job is cancelled), even if the linkcheck failed.
See https://stackoverflow.com/a/58859404 for more.
It's super annoying to be forced to use this bad convention, and
apparently everyone agrees. The only reason no improvements have been
done is because those were blocked on writing a better checker.
I strongly believe that no checker is better than a bad checker, so
let's just delete it in the meantime. I kindly asked anyone who sees
this to complain about overly long sentences in review in the future, I
think we can make this turn out fine.
This tool looks for HTML comments like `<!-- date: 2021-01 -->` in each
Markdown source file and compiles a list of dates that are older than
six months. It then opens an issue with that list, with checkboxes for
each file and date. Note that it will only open an issue if there was at
least one date older than six months; it does nothing if the list is
empty.
This tool is automatically run monthly in a GitHub Actions workflow.
I have tested the tool on a private repo and confirmed that it works.
