Automate releasing new versions of stable Rust

[paolobarbolini]

After Rust 1.83 was released during a major holiday, there was some interest around what was causing the release to Docker Hub to be delayed.

I've been passively watching docker-library/official-images for a while now, and I've noticed that some projects are using bots to submit new releases, for example:

Project	Example PR	Tools used
Node.js	docker-library/official-images#17944	GitHub Actions workflow https://github.com/nodejs/docker-node/blob/ec383c1870b8ce0bb9d74c89a0897ed58eb61896/.github/workflows/official-pr.yml#L16-L70
Arch Linux	docker-library/official-images#17992	Gitlab CI script https://gitlab.archlinux.org/archlinux/archlinux-docker/-/blob/61cb892bfc251e46f73e716ceb3b903ec4e9e725/.gitlab-ci.yml#L317-372
Clear Linux OS	docker-library/official-images#17993	N/A
AlmaLinux	docker-library/official-images#17928	N/A

Given that several bots are already being used to run rust-lang, should there also be something for releasing docker-official images?

[sfackler]

It is probably worth doing (we could also automate the PR on this repo). I don't know if it would have fixed the 1.83 delay though, since iirc that was waiting on a human on the Docker side to +1.