ci: run unit tests on all supported python versions

python unit tests running via GitHub Actions were only
running with python 3.10

the project supports all python versions greater than or
equal to 3.10

this commit adds 3.11, 3.12, and 3.13 to the test matrix
for better coverage and confidence for non-3.10 users

Signed-off-by: Nathan Weinberg <nweinber@redhat.com>

.github/workflows/unit-tests.yml

@@ -8,29 +8,37 @@ on:
 jobs:
   unit-tests:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python:
+          - "3.10"
+          - "3.11"
+          - "3.12"
+          - "3.13"
     steps:
       - uses: actions/checkout@v4
 
-      - name: Set up Python
+      - name: Set up Python ${{ matrix.python }}
         uses: actions/setup-python@v5
         with:
-          python-version: '3.10'
+          python-version: ${{ matrix.python }}
 
       - uses: astral-sh/setup-uv@v5
         with:
-          python-version: '3.10'
+          python-version: ${{ matrix.python }}
           enable-cache: false
 
       - name: Run unit tests
         run: |
-          uv run -p 3.10 --with-editable . --with-editable ".[dev]" --with-editable ".[unit]" pytest --cov=llama_stack -s -v tests/unit/ --junitxml=pytest-report.xml
+          uv run --python ${{ matrix.python }} --with-editable . --with-editable ".[dev]" --with-editable ".[unit]" pytest --cov=llama_stack -s -v tests/unit/ --junitxml=pytest-report-${{ matrix.python }}.xml
 
       - name: Upload test results
         if: always()
         uses: actions/upload-artifact@v4
         with:
-          name: test-results
+          name: test-results-${{ matrix.python }}
           path: |
             .pytest_cache/
-            pytest-report.xml
+            pytest-report-${{ matrix.python }}.xml
           retention-days: 7