GH Actions: Fix homebrew-maximal, remove opensuse-15.2.1

[mkoeppe]

homebrew-maximal is broken because there's no gcc@12 package yet.
https://github.com/sagemath/sage/runs/5353146513?check_suite_focus=true

opensuse-15.2.1 is broken badly because apparently the Docker image is not maintained (https://github.com/sagemath/sage/runs/5353145981?check_suite_focus=true), so this test is useless for us

The workflows for testing optional packages should not test sagemath_doc_pdf because that is best tested on top of the regular Sage build.

CC: @dimpase @kliem

Component: porting

Author: Matthias Koeppe

Branch/Commit: 1251c35

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/33430

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

Branch: u/mkoeppe/gh_actions__fix_homebrew_maximal__remove_opensuse_15_2_1

[mkoeppe]

Commit: 1251c35

[mkoeppe]

New commits:

06fe5d6	build/pkgs/_gcc12/distros/homebrew.txt: Remove
30ec608	.github/workflows, tox.ini: Remove opensuse-15.2.1 (defunct)
1251c35	.github/workflows: Filter optional/experimental packages using --no-file huge --no-file has_nonfree_dependencies; filter out sagemath_doc_pdf

[mkoeppe]

Reviewer: https://github.com/mkoeppe/sage/actions/runs/1926493514

[mkoeppe]

comment:7

Let's get this in please

[dimpase]

comment:8

why does tox.ini still have opensuse-15.0,opensuse-15.1, opensuse-15.2, even though they are not used?

[mkoeppe]

comment:9

tox.ini defines platforms that we can test.
Only a subset is run on GH Actions

[dimpase]

comment:10

lgtm

[dimpase]

Changed reviewer from https://github.com/mkoeppe/sage/actions/runs/1926493514 to Dima Pasechnik

[mkoeppe]

comment:11

Thanks!

[vbraun]

Changed branch from u/mkoeppe/gh_actions__fix_homebrew_maximal__remove_opensuse_15_2_1 to 1251c35