[Madoshakalaka#75] use tox on windows jobs

Signed-off-by: Bryant Finney <[email protected]>

.gitlab/ci/Install-Pyenv.ps1

@@ -0,0 +1,23 @@
+# -------------------------------------------------------------------------------------
+# Summary: Install `pyenv`, populating shell variables needed to run it.
+# Created: 2021-11-08 21:16:59
+# Author:  Bryant Finney (https://bryant-finney.github.io/about)
+# -------------------------------------------------------------------------------------
+choco install -y pyenv-win
+
+Write-Output '1. add PYENV, PPYENV_HOME, and PYENV_ROOT environment variables'
+$env:PYENV = $env:USERPROFILE + '\.pyenv\pyenv-win\'
+$env:PYENV_ROOT = $env:USERPROFILE + '\.pyenv\pyenv-win\'
+$env:PYENV_HOME = $env:USERPROFILE + '\.pyenv\pyenv-win\'
+
+Write-Output '2. update the PATH variable'
+$env:Path = -Join (
+    $env:USERPROFILE,
+    '\.pyenv\pyenv-win\bin;',
+    $env:USERPROFILE,
+    '\.pyenv\pyenv-win\shims;',
+    $env:Path
+)
+
+pyenv --version
+pyenv rehash

.gitlab/ci/main.yml

@@ -10,13 +10,6 @@ workflow:
       when: never
     - when: always
 
-.parallel python versions:
-  # jobs that extend this one are executed in parallel
-  parallel:
-    matrix:
-      - PY_MAJOR: 3
-        PY_MINOR: [6, 7, 8]
-
 update python images:
   # when the pipeline is executed on a schedule / manually, update the Docker images
   # in the project registry
@@ -25,7 +18,10 @@ update python images:
   before_script:
     - docker login $CI_REGISTRY -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD
 
-  extends: [.parallel python versions]
+  parallel:
+    matrix:
+      - PY_MAJOR: 3
+        PY_MINOR: [6, 7, 8]
 
   image: docker:20.10
   needs: []
@@ -56,17 +52,27 @@ tox:
   stage: test
 
 tox:windows:
-  before_script: [choco install -y pyenv-win]
+  before_script:
+    - . .\.gitlab\ci\Install-Pyenv.ps1
+    - pyenv install $PY_VERSION
+    - pyenv global $PY_VERSION
+    - pip install tox
   image: null
   needs: []
 
+  parallel:
+    matrix:
+      - { PY_MAJOR: 3, PY_MINOR: 6, PY_PATCH: 8 }
+      - { PY_MAJOR: 3, PY_MINOR: 7, PY_PATCH: 9 }
+      - { PY_MAJOR: 3, PY_MINOR: 8, PY_PATCH: 10 }
+
   script:
-    - pyenv --version
-    - pyenv rehash
-    - foreach ($py_version in "3.6.15","3.7.12","3.8.12"){pyenv install $py_version}
+    - tox -e py${PY_MAJOR}${PY_MINOR} .
 
   stage: test
   tags:
     - shared-windows
     - windows
     - windows-1809
+  variables:
+    PY_VERSION: ${PY_MAJOR}.${PY_MINOR}.${PY_PATCH}