feat: full upgrade to python3, tests, etc.

.github/workflows/python-tests.yml

@@ -0,0 +1,35 @@
+name: Python tests
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+
+permissions: read-all
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+    - name: Set up Python
+      uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236 # v4.7.1
+
+    - name: Install dependencies
+      shell: bash
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest pytest-cov ruff
+
+    - name: Run Ruff linting
+      shell: bash
+      run: ruff check .
+
+    - name: Run tests with coverage
+      shell: bash
+      run: |
+        pytest --cov=aeonview --cov-report=term-missing