.github/workflows/*.yml: Use max-parallel so that the multi-stage workflows get a chance to run

Author: Matthias Koeppe

.github/workflows/tox-optional.yml

@@ -34,8 +34,9 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      max-parallel: 6
       matrix:
-        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-eoan, ubuntu-focal, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, centos-7, centos-8, archlinux-latest, slackware-14.2, ubuntu-bionic-i386, ubuntu-eoan-i386, debian-buster-i386, centos-7-i386]
+        tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-eoan, ubuntu-focal, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, centos-7, centos-8, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-eoan-i386, debian-buster-i386, centos-7-i386]
         tox_packages_factor: [maximal]
     env:
       TOX_ENV: docker-${{ matrix.tox_system_factor }}-${{ matrix.tox_packages_factor }}
@@ -100,6 +101,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        max-parallel: 3
         tox_system_factor: [homebrew-macos-python2, homebrew-macos, homebrew-macos-python3_xcode, homebrew-macos-python3_xcode-nokegonly, homebrew-macos-python3_pythonorg, conda-forge-macos]
         tox_packages_factor: [maximal]
     env:

.github/workflows/tox.yml

@@ -34,6 +34,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      max-parallel: 20
       matrix:
         tox_system_factor: [ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, ubuntu-eoan, ubuntu-focal, debian-jessie, debian-stretch, debian-buster, debian-bullseye, debian-sid, linuxmint-17, linuxmint-18, linuxmint-19, linuxmint-19.3, fedora-26, fedora-27, fedora-28, fedora-29, fedora-30, fedora-31, fedora-32, centos-7, centos-8, archlinux-latest, slackware-14.2, conda-forge, ubuntu-bionic-i386, ubuntu-eoan-i386, debian-buster-i386, centos-7-i386]
         tox_packages_factor: [minimal, standard, standard-python2]
@@ -99,6 +100,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       fail-fast: false
+      max-parallel: 4
       matrix:
         tox_system_factor: [homebrew-macos-python2, homebrew-macos, homebrew-macos-python3_xcode, homebrew-macos-python3_xcode-nokegonly, homebrew-macos-python3_pythonorg, homebrew-macos-python3_xcode-gcc_spkg, conda-forge-macos]
         tox_packages_factor: [minimal, standard]
@@ -142,6 +144,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+      max-parallel: 1
       matrix:
         tox_system_factor: [conda-forge-ubuntu]
         tox_packages_factor: [minimal, standard, standard-python2]