Add matrix on python version to testing workflow

.github/workflows/pytest.yml

@@ -16,6 +16,15 @@ env:
 jobs:
   pytest:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python:
+          - 3.8
+          - 3.9
+          - '3.10'
+          # 3.11 needs more work
+          #- '3.11'
+          #- '3.12'
     steps:
     - name: Configure environment
       run: |
@@ -28,10 +37,10 @@ jobs:
       with:
         fetch-depth: 0
 
-    - name: Setup Python 3.10
+    - name: Setup Python
       uses: actions/setup-python@v4
       with:
-        python-version: '3.10'
+        python-version: ${{ matrix.python }}
 
     - name: Create venv and poetry build
       run: |