Trac #31095: tox.ini, GH Actions: Remove ubuntu-eoan

This has been failing for a while now on GH Actions.
{{{
Ign:1 http://security.ubuntu.com/ubuntu eoan-security InRelease
Err:2 http://security.ubuntu.com/ubuntu eoan-security Release
  404  Not Found [IP: 91.189.91.39 80]
Ign:3 http://archive.ubuntu.com/ubuntu eoan InRelease
Ign:4 http://archive.ubuntu.com/ubuntu eoan-updates InRelease
Ign:5 http://archive.ubuntu.com/ubuntu eoan-backports InRelease
Err:6 http://archive.ubuntu.com/ubuntu eoan Release
  404  Not Found [IP: 91.189.88.152 80]
Err:7 http://archive.ubuntu.com/ubuntu eoan-updates Release
  404  Not Found [IP: 91.189.88.152 80]
Err:8 http://archive.ubuntu.com/ubuntu eoan-backports Release
  404  Not Found [IP: 91.189.88.152 80]
Reading package lists...
E: The repository 'http://security.ubuntu.com/ubuntu eoan-security
Release' does not have a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu eoan Release' does
not have a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu eoan-updates
Release' does not have a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu eoan-backports
Release' does not have a Release file.
}}}

https://fridge.ubuntu.com/2020/07/17/ubuntu-19-10-eoan-ermine-end-of-
life-reached-on-july-17-2020/

URL: https://trac.sagemath.org/31095
Reported by: mkoeppe
Ticket author(s): Matthias Koeppe
Reviewer(s): Jonathan Kliem

Author: Release Manager

.github/workflows/tox-experimental.yml

@@ -36,7 +36,7 @@ jobs:
       fail-fast: false
       max-parallel: 6
       matrix:
-        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-eoan, ubuntu-focal, ubuntu-groovy, ubuntu-hirsute, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, linuxmint-20.1, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, fedora-32, fedora-33, fedora-34, centos-7, centos-8, gentoo, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-focal-i386, debian-buster-i386, centos-7-i386]
+        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-focal, ubuntu-groovy, ubuntu-hirsute, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, linuxmint-20.1, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, fedora-32, fedora-33, fedora-34, centos-7, centos-8, gentoo, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-focal-i386, debian-buster-i386, centos-7-i386]
         tox_packages_factor: [maximal]
         targets_pattern: [0-g, h-o, p, q-z]
     env:

.github/workflows/tox-optional.yml

@@ -36,7 +36,7 @@ jobs:
       fail-fast: false
       max-parallel: 6
       matrix:
-        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-eoan, ubuntu-focal, ubuntu-groovy, ubuntu-hirsute, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, linuxmint-20.1, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, fedora-32, fedora-33, fedora-34, centos-7, centos-8, gentoo, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-focal-i386, debian-buster-i386, centos-7-i386]
+        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-focal, ubuntu-groovy, ubuntu-hirsute, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, linuxmint-20.1, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, fedora-32, fedora-33, fedora-34, centos-7, centos-8, gentoo, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-focal-i386, debian-buster-i386, centos-7-i386]
         tox_packages_factor: [maximal]
         targets_pattern: [0-g, h-o, p, q-z]
     env:

.github/workflows/tox.yml

@@ -36,7 +36,7 @@ jobs:
       fail-fast: false
       max-parallel: 20
       matrix:
-        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-eoan, ubuntu-focal, ubuntu-groovy, ubuntu-hirsute, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, linuxmint-20.1, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, fedora-32, fedora-33, fedora-34, centos-7, centos-8, gentoo, gentoo-python3.7, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-focal-i386, debian-buster-i386, centos-7-i386]
+        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-focal, ubuntu-groovy, ubuntu-hirsute, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, linuxmint-20.1, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, fedora-32, fedora-33, fedora-34, centos-7, centos-8, gentoo, gentoo-python3.7, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-focal-i386, debian-buster-i386, centos-7-i386]
         tox_packages_factor: [minimal, standard]
     env:
       TOX_ENV: docker-${{ matrix.tox_system_factor }}-${{ matrix.tox_packages_factor }}

tox.ini

@@ -19,7 +19,7 @@ envlist =
     ### "docker" toxenvs copy sources from the source tree subject to the exclusions in
     ### the file ".dockerignore".  This should work out of non-clean source trees, and all
     ### "docker" toxenvs can be run in parallel.
-    docker-{ubuntu-{trusty,xenial,bionic,latest,eoan,rolling,focal,devel},
+    docker-{ubuntu-{trusty,xenial,bionic,latest,rolling,focal,devel},
             debian-{jessie,stretch,buster,bullseye,sid},
             linuxmint-{17,18,19,19.1,19.2,19.3},
             fedora-{26,27,28,29,30,31,32},
@@ -149,7 +149,6 @@ setenv =
     ubuntu-xenial:                             IGNORE_MISSING_SYSTEM_PACKAGES=yes
     ubuntu-bionic:    BASE_TAG=bionic
     ubuntu-bionic:                             IGNORE_MISSING_SYSTEM_PACKAGES=yes
-    ubuntu-eoan:      BASE_TAG=eoan
     ubuntu-focal:     BASE_TAG=focal
     ubuntu-groovy:    BASE_TAG=groovy
     ubuntu-hirsute:   BASE_TAG=hirsute