Cannot find out what options are valid for --revision

[rrnewton]

I want to install rust in a Dockerfile in a way that is reproducible, and future proof. The apt install rustc is too old, so I'm trying rustup.

I was reading the --help for rustup. It has this example:

rustup.sh --revision=1.0.0-beta

But I cannot find any way to enumerate valid options for revision. Here's a dockerfile that mentions "1.4.0".. In fact, "1.4.0" worked for me, but "1.0.0-beta" from the docs did not. Nor did "1.13.0-beta".

I was able to get "1.12.0" to work, which is fine for my purposes, but:

1. it would be great to have a page to visit to enumerate these, ideally linked from the docs
2. I don't know if this is intended to be a stable way to install rust that will work N years in the future.