posts: announce rustup 1.28.0

[rami3l]

Following rust-lang/rustup#4204, this is the 3rd PR in the stable release process of rustup v1.28.0, as per https://rust-lang.github.io/rustup/dev-guide/release-process.html.

I'm first creating this as a draft to avoid it being accidentally merged before the actual release process starts.

cc @rust-lang/rustup

Rendered

[ChrisDenton]

I mentioned on discord that rustup releases can come with problems not caused by rustup itself but just due to having a new release.

• Anti-malware scanners blocking rustup or stopping it from creating or copying files (especially a lot of small files like html docs).
• CI issues before the hosted version is updated across all runners. Because rustup seldom updates, people rarely get a chance to test this situation.

Perhaps there should be a short section mentioning known issues like this?

[rami3l]

@ChrisDenton Yes, you're right. The CI self-update mitigation is implemented in v1.28.0, which means, unfortunately, the existing v1.27.1 will have problems updating to the new version.

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Update: The post now includes a new ## Caveats section.