From https://groups.google.com/d/msg/sage-devel/yJODg-JurdA/qKPgzDB3BgAJ

From: https://scientificlinux.org/downloads/sl-versions/ (2021-03)
Maintained Releases

• SL7 (7.0-7.9) https://scientificlinux.org/downloads/sl-versions/sl7/ EOL: 2024-06
  • to test: tox -e docker-scientificlinux-7-standard
• SL6 (6.0-6.10) https://scientificlinux.org/downloads/sl-versions/sl6/ EOL: 2020-11
  • links to versions on website are broken, and although a docker image exists, there is no working package repository

https://hub.docker.com/r/scientificlinux/sl/

Depends on #30195

CC: @NathanDunfield @dimpase @isuruf @kliem

Component: porting

Author: Matthias Koeppe

Branch/Commit: 62bdf69

Reviewer: Jonathan Kliem

Issue created by migration from https://trac.sagemath.org/ticket/30213