tox.ini, GitHub CI workflow - minor fixes, more homebrew configuration factors, improve docker interface

[mkoeppe]

This makes the following changes to tox.ini:

• tox -e local-homebrew-macos-standard now uses python3 from homebrew.

  This attempts to reproduce the environment of https://groups.google.com/d/msg/sage-release/kU5M1QVuQQY/Zu10Q-CKAwAJ

• tox -e local-homebrew-macos-standard-python3_xcode uses /usr/bin/python3 (was the old default)

• tox -e local-homebrew-macos-standard-python3_pythonorg uses the Python 3.7 installation from the binary package from python.org

New toolchain factors: gcc_spkg, gcc_9.

Improved docker interface.

CC: @jhpalmieri @dimpase @orlitzky @kliem @vbraun

Component: porting

Author: Matthias Koeppe

Branch/Commit: b7bb418

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/29417

[mkoeppe]

Dependencies: #29087, #29354

[mkoeppe]

Branch: u/mkoeppe/tox-ci-minor-fixes

[mkoeppe]

Changed dependencies from #29087, #29354 to #29087, #29354, #29418

[mkoeppe]

Last 10 new commits:

fbb7393	Fixup packages
cfcd8f2	build/bin/sage-guess-package-system, build/bin/sage-print-system-package-command: Handle slackware too
136feeb	build/bin/sage-spkg: Show equivalent system packages for ALL distros
9939051	Merge branch 't/29354/tox_ini__add_slackware_environments' into t/29087/CI-gh-actions-tox-configure-build
4ac9e24	Reduce SAGE_NUM_THREADS to 3
1cb8f98	build/pkgs/curl/distros/slackware.txt: Add openldap-client
eee2877	build/pkgs/slackware.txt: Add ca-certificates
c1931f5	build/pkgs/curl/distros/slackware.txt: Add libssh2
3145467	Merge branch 't/29354/tox_ini__add_slackware_environments' into t/29087/CI-gh-actions-tox-configure-build
b259671	[tox-local-homebrew-macos] Repair make parallelization

[mkoeppe]

Commit: b259671

[mkoeppe]

Author: Matthias Koeppe

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

bd24641	build/bin/sage-download-file: Add option --no-check-certificate
e143939	build/bin/sage-spkg: Append to SAGE_DOWNLOAD_FILE_OPTIONS instead of overwriting it
710b52d	Merge branch 't/29418/sage_download_file__fix_certificate_problems_with_https_downloads_on_macos_python3' into t/29417/tox-ci-minor-fixes
b1489e7	tox.ini: Set SAGE_DOWNLOAD_FILE_OPTIONS=--no-check-certificate

[sagetrac-git]

Changed commit from b259671 to b1489e7

[mkoeppe]

Changed dependencies from #29087, #29354, #29418 to #29087, #29354, #29418, #29415

[sagetrac-git]

Changed commit from b1489e7 to 846f14e

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. Last 10 new commits:

354cf90	Use conda-install --yes --quiet
df609e0	Merge branch 't/29415/tox_ini__add_environment_local_conda' into t/29417/tox-ci-minor-fixes
cf27321	build/bin/sage-download-file: Add option --no-check-certificate
90ea00b	build/bin/sage-spkg: Append to SAGE_DOWNLOAD_FILE_OPTIONS instead of overwriting it
bccc2c2	Merge branch 't/29418/sage_download_file__fix_certificate_problems_with_https_downloads_on_macos_python3' into t/29417/tox-ci-minor-fixes
87b7351	tox.ini: Add configuration factors python3, macos-python3_xcode, macos-python3_pythonorg
329ea99	tox.yml: Test more homebrew configs
de1bce2	tox.yml: Add local-ubuntu-conda test
86d5c84	tox.ini: Add toolchain factors
846f14e	tox.yml: Test more Fedora, no conda

[mkoeppe]

Changed dependencies from #29087, #29354, #29418, #29415 to #29087, #29418, #29415

[sagetrac-git]

Changed commit from 846f14e to 9838fd7

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

9838fd7

fixup

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

a3ccd46

build/pkgs/python3/distros/homebrew.txt: New