Update ci.yml

Author: altendky

.github/workflows/ci.yml

@@ -146,7 +146,15 @@ jobs:
         if: ${{ job.container == '' }}
         uses: actions/setup-python@v2
         with:
-          python-version: ${{ fromJSON(format('["{0}", "{1}"]', format('{0}.0-alpha - {0}.X', matrix.python), matrix.python))[startsWith(matrix.python, 'pypy')] }}
+          # This allows the matrix to specify just the major.minor version while still
+          # expanding it to get the latest patch version including alpha releases.
+          # This avoids the need to update for each new alpha, beta, release candidate,
+          # and then finally an actual release version.  actions/setup-python doesn't
+          # support this for PyPy presently so we get no help there.
+          # 
+          # CPython -> 3.9.0-alpha - 3.9.X
+          # PyPy    -> pypy-3.7
+          python-version: ${{ fromJSON(format('["{0}", "{1}"]', format('{0}.0-alpha - {0}.X', matrix.python.action), matrix.python.action))[startsWith(matrix.python.action, 'pypy')] }}
           architecture: x64
       - name: Report Python information
         shell: bash