Install/upgrade mingw in GHA for Windows

Author: domdfcoding

.github/workflows/python_ci.yml

@@ -69,6 +69,7 @@ jobs:
           python -m site
           python -m pip install --upgrade pip setuptools wheel
           python -m pip install --upgrade tox~=3.0 virtualenv!=20.16.0
+          choco install mingw -y
 
       - name: "Run Tests for Python ${{ matrix.config.python-version }}"
         if: steps.setup-python.outcome == 'success'

repo_helper.yml

@@ -63,3 +63,8 @@ extra_sphinx_extensions:
 sphinx_conf_epilogue:
  - "	from sphinx_toolbox.latex import replace_unknown_unicode"
  - '	app.connect("build-finished", replace_unknown_unicode)'
+
+github_ci_requirements:
+ Windows:
+  post:
+   - choco install mingw -y