CI(GHActions): Use `conda` to install older Pythons

Ubuntu >= 22 and `setup-python` dropped Pythons < 3.7.
Use `s-weigand/setup-conda` instead of `setup-python`.

diff --git a/.github/workflows/run-tests.yaml b/.github/workflows/run-tests.yaml
index 4db3d8e3fdfd19450016c426111e6cdb194216a4..7577e272adbbb68f3fbfc3245a412420f9fb88a7 100644 (file)
--- a/.github/workflows/run-tests.yaml
+++ b/.github/workflows/run-tests.yaml
@@ -4,10 +4,12 @@ on: [push, pull_request]
 
 jobs:
   run-tests:
+    env:
+      not_in_conda: "['3.11', 'pypy-3.7']"
 
     strategy:
       matrix:
-        python-version: ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "pypy-2.7", "pypy-3.7"]
+        python-version: ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "pypy-3.7"]
 
     name: Python ${{ matrix.python-version }}
     runs-on: ubuntu-latest
@@ -16,9 +18,14 @@ jobs:
 
       # Setup Python/pip
       - uses: actions/checkout@v2
+      - uses: s-weigand/setup-conda@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+        if: ${{ runner.os == 'Linux' && !contains(fromJSON(env.not_in_conda), matrix.python-version) }}
       - uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
+        if: ${{ runner.os != 'Linux' || contains(fromJSON(env.not_in_conda), matrix.python-version) }}
       - name: Cache pip
         uses: actions/cache@v3
         with:
@@ -37,7 +44,7 @@ jobs:
         run: |
           import os, sys
           if hasattr(sys, 'pypy_version_info'):
-            toxenv = 'pypy'
+            toxenv = 'pypy3'
           else:
             pyver = '%d%d' % tuple(sys.version_info[:2])
             toxenv = 'py%s' % pyver