Enbale github actions run on tox

Author: traylenator

.github/workflows/ci.yml

@@ -1,30 +1,60 @@
+# .github/workflows/ci.yml
 name: CI
-
 on:
   push:
   pull_request:
 
 jobs:
-  tests:
+  tox:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.6", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python: ["3.6", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        include:
+          # Older CPythons live on Debian Buster images
+          - python: "3.6"
+            image: "python:3.6-buster"
+          # Current releases use Debian Bookworm images
+          - python: "3.9"
+            image: "python:3.9-bookworm"
+          - python: "3.10"
+            image: "python:3.10-bookworm"
+          - python: "3.11"
+            image: "python:3.11-bookworm"
+          - python: "3.12"
+            image: "python:3.12-bookworm"
+          - python: "3.13"
+            image: "python:3.13-bookworm"
+          # If 3.14 is still pre-release for you, switch to 3.14-rc-bookworm.
+          - python: "3.14"
+            image: "python:3.14-bookworm"
+
+    # Run each matrix entry *inside* the chosen Python image
+    container:
+      image: ${{ matrix.image }}
+
     steps:
       - uses: actions/checkout@v4
 
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+      # Cache pip inside the container filesystem
+      - name: Set up pip cache
+        uses: actions/cache@v4
         with:
-          python-version: ${{ matrix.python-version }}
-          cache: "pip"
+          path: |
+            ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ matrix.python }}-${{ hashFiles('**/pyproject.toml', '**/requirements*.txt', 'tox.ini', 'setup.cfg', 'setup.py') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-${{ matrix.python }}-
+
+      - name: Show Python
+        run: python -V && which python && pip -V
 
-      - name: Install tox (and plugin to map py versions)
+      - name: Upgrade pip & install tox
         run: |
-          python -m pip install --upgrade pip
-          pip install tox tox-gh-actions
+            python -m pip install --upgrade pip
+            pip install tox
 
-      - name: Run tox
-        run: tox
+      - name: Run tox for current interpreter
+        run: tox -e py